libevent: update to version 2.1.8

devel/libevent/Portfile

@@ -3,9 +3,8 @@
 PortSystem          1.0
 PortGroup           github 1.0
 
-github.setup        libevent libevent 2.0.22-stable release-
+github.setup        libevent libevent 2.1.8-stable release-
 version             [lindex [split ${version} -] 0]
-revision            3
 categories          devel
 platforms           darwin
 license             BSD
@@ -20,17 +19,13 @@ long_description    The libevent API provides a mechanism to execute \
                     callbacks due to signals or regular timeouts.
 
 homepage            http://libevent.org
-github.tarball_from releases
 
-checksums           rmd160  6a7e8e3ebcfd2227fa807a604b5c773c90c8b8cc \
-                    sha256  71c2c49f0adadacfdbe6332a372c38cf9c8b7895bb73dabeaa53cdcc1d4e1fa3
+checksums           rmd160  f23ad93d555089535085c99f3f8cbb9ebae4fd53 \
+                    sha256  d53e88f2b31fbccab93f6b1e54fe7f4c1d536b6d8250c95cd42dbc14f958baeb
 
 depends_lib         path:lib/libssl.dylib:openssl
 
-# Don't accidentally create flat-namespace dylibs on Yosemite (#44596).
-patchfiles          yosemite-libtool.patch
-
-patchfiles-append   patch-sierra-kqueue.diff
+use_autoreconf      yes
 
 test.run            yes
 test.target         verify