nghttp2: permit build w/o python

Closes: https://trac.macports.org/ticket/58287
remove traces of python34

www/nghttp2/Portfile

@@ -28,18 +28,6 @@ checksums           rmd160  6743620cb9e0001b4ba8401cb744cd544a9f70c9 \
 # nghttp2 requires C++14
 compiler.blacklist-append {clang < 602}
 
-if {![variant_isset python34] && ![variant_isset python35] && ![variant_isset python36] && ![variant_isset python37]} { default_variants +python27 }
-
-if {![variant_isset python27] && ![variant_isset python34] && ![variant_isset python35] && ![variant_isset python36] && ![variant_isset python37]} {
-    error "You must select one of the python variants."
-}
-
-if {[variant_isset python27]} { set PythonVersion   2.7 }
-if {[variant_isset python35]} { set PythonVersion   3.5 }
-if {[variant_isset python36]} { set PythonVersion   3.6 }
-if {[variant_isset python37]} { set PythonVersion   3.7 }
-set PythonBranch    [join [lrange [split ${PythonVersion} .] 0 1] ""]
-
 depends_build       port:pkgconfig
 
 depends_lib         port:c-ares \
@@ -48,43 +36,61 @@ depends_lib         port:c-ares \
                     port:libevent \
                     port:libxml2 \
                     path:lib/libssl.dylib:openssl \
-                    port:py${PythonBranch}-cython \
-                    port:py${PythonBranch}-setuptools \
-                    port:python${PythonBranch} \
                     port:zlib
 
 # See: https://trac.macports.org/ticket/57960
-patchfiles-append   patch-src-shrpx_client_handler.cc.diff \
+patchfiles-append   patch-configure-nopython.diff \
+                    patch-src-shrpx_client_handler.cc.diff \
                     src-shrpx_config.diff
 
+use_autoreconf      yes
+
 configure.args      --disable-silent-rules \
                     --disable-threads \
                     --enable-app \
                     ac_cv_prog_AWK=/usr/bin/awk
 
+configure.env       JANSSON_CFLAGS=-I${prefix}/include \
+                    LIBEVENT_OPENSSL_CFLAGS=-I${prefix}/include/event2 \
+                    OPENSSL_CFLAGS=-I${prefix}/include/openssl
+
 if {[vercmp [macports_version] 2.5.99] >= 0} {
-configure.env       CYTHON=${prefix}/bin/cython-${PythonVersion} \
-                    JANSSON_CFLAGS=-I${prefix}/include \
+    configure.env-append \
                     "JANSSON_LIBS=-L${prefix}/lib -ljansson" \
-                    LIBEVENT_OPENSSL_CFLAGS=-I${prefix}/include/event2 \
                     "LIBEVENT_OPENSSL_LIBS=-L${prefix}/lib -levent -levent_openssl" \
-                    OPENSSL_CFLAGS=-I${prefix}/include/openssl \
-                    "OPENSSL_LIBS=-L${prefix}/lib -lcrypto -lssl" \
-                    PYTHON=${prefix}/bin/python${PythonVersion}
+                    "OPENSSL_LIBS=-L${prefix}/lib -lcrypto -lssl"
 } else {
-configure.env       CYTHON=${prefix}/bin/cython-${PythonVersion} \
-                    JANSSON_CFLAGS=-I${prefix}/include JANSSON_LIBS="-L${prefix}/lib -ljansson" \
-                    LIBEVENT_OPENSSL_CFLAGS=-I${prefix}/include/event2 \
+    configure.env-append \
+                    JANSSON_LIBS="-L${prefix}/lib -ljansson" \
                     LIBEVENT_OPENSSL_LIBS="-L${prefix}/lib -levent -levent_openssl" \
-                    OPENSSL_CFLAGS=-I${prefix}/include/openssl \
-                    OPENSSL_LIBS="-L${prefix}/lib -lcrypto -lssl" \
-                    PYTHON=${prefix}/bin/python${PythonVersion}
+                    OPENSSL_LIBS="-L${prefix}/lib -lcrypto -lssl"
 }
 
-destroot.env        PYTHONPATH=${destroot}${prefix}/lib/python${PythonVersion}/site-packages/
+if {[variant_isset python27]} { set PythonVersion   2.7 }
+if {[variant_isset python36]} { set PythonVersion   3.6 }
+if {[variant_isset python37]} { set PythonVersion   3.7 }
+
+if {[variant_isset python27] || [variant_isset python36] || [variant_isset python37]} {
+    set PythonBranch    [join [lrange [split ${PythonVersion} .] 0 1] ""]
+
+    depends_lib-append \
+                    port:py${PythonBranch}-cython \
+                    port:py${PythonBranch}-setuptools \
+                    port:python${PythonBranch}
+
+    configure.env-append \
+                    CYTHON=${prefix}/bin/cython-${PythonVersion} \
+                    PYTHON=${prefix}/bin/python${PythonVersion}
 
-pre-destroot {
-    xinstall -d ${destroot}${prefix}/lib/python${PythonVersion}/site-packages/
+    destroot.env        PYTHONPATH=${destroot}${prefix}/lib/python${PythonVersion}/site-packages/
+
+    pre-destroot {
+        xinstall -d ${destroot}${prefix}/lib/python${PythonVersion}/site-packages/
+    }
+} else {
+    configure.args-append \
+                    --disable-python-bindings \
+                    --without-cython
 }
 
 variant python27 conflicts python35 python36 python37 description {Build using Python 2.7} {

www/nghttp2/files/patch-configure-nopython.diff

@@ -0,0 +1,20 @@
+diff --git a/configure.ac b/configure.ac
+index 051eb139..e2a00ac8 100644
+--- configure.ac
++++ configure.ac
+@@ -151,8 +151,6 @@ AC_PROG_MKDIR_P
+
+ PKG_PROG_PKG_CONFIG([0.20])
+
+-AM_PATH_PYTHON([2.7],, [:])
+-
+ if [test "x$request_lib_only" = "xyes"]; then
+   request_app=no
+   request_hpack_tools=no
+@@ -161,6 +159,7 @@ if [test "x$request_lib_only" = "xyes"]; then
+ fi
+
+ if [test "x$request_python_bindings" != "xno"]; then
++  AM_PATH_PYTHON([2.7],, [:])
+   AX_PYTHON_DEVEL([>= '2.7'])
+ fi