libccd: fix problem with hard-coded libm path, use more standard way …

…to set cmake bool flags

science/libccd/Portfile

@@ -4,20 +4,24 @@ PortGroup  github 1.0
 
 github.setup        danfis libccd 2.1 v
 epoch               20190111
-revision            0
+revision            1
 categories          science
 maintainers         nomaintainer
 description         A library for collision detection between convex shapes
 long_description    $description
 platforms           darwin
 license             BSD
-configure.args-append -DCCD_DOUBLE=true
+configure.args-append -DCCD_DOUBLE:BOOL=ON
 
 checksums           rmd160  6e36c4276ac47b3e79dadc0b0e2ecf42f36e5b20 \
                     sha256  aa00bcff8781528144557c0c92fc4f70f6505903d6ef07fd56998f352402aeff \
                     size    73979
 
+post-patch {
+    reinplace "s|if(NOT WIN32)|if(NOT WIN32 AND NOT APPLE)|" ${worksrcpath}/src/CMakeLists.txt
+}
+
 variant single_precision {
-    configure.args-delete -DCCD_DOUBLE=true
-    configure.args-append -DCCD_SINGLE=true
+    configure.args-delete -DCCD_DOUBLE:BOOL=ON
+    configure.args-append -DCCD_SINGLE:BOOL=ON
 }