mod_v8: Improved build for some version of gcc and (hopefully) fixed build on OSX

configure.in

@@ -501,6 +501,7 @@ PLATFORM_CORE_LIBS=
 # tweak platform specific flags
 case "$host" in
     *darwin12.*|*darwin11.*)
+        is_macosx=yes
         APR_ADDTO(SWITCH_AM_CFLAGS, -DMACOSX)
         APR_ADDTO(CFLAGS, -pipe -no-cpp-precomp -Wno-deprecated-declarations)
         APR_ADDTO(LDFLAGS, -pipe -bind_at_load)
@@ -512,6 +513,7 @@ case "$host" in
 	APR_ADDTO([PLATFORM_CORE_LIBS], [-ldl])
     ;;
     *darwin10.*)
+        is_macosx=yes
         APR_ADDTO(SWITCH_AM_CFLAGS, -DMACOSX)
         APR_ADDTO(CFLAGS, -pipe -no-cpp-precomp)
         APR_ADDTO(LDFLAGS, -pipe -bind_at_load)
@@ -523,6 +525,7 @@ case "$host" in
 	APR_ADDTO([PLATFORM_CORE_LIBS], [-ldl])
     ;;
     *darwin*)
+        is_macosx=yes
         APR_ADDTO(SWITCH_AM_CFLAGS, -DMACOSX)
         APR_REMOVEFROM(SWITCH_AM_CFLAGS, -fPIC)
 	if test "x$enable_core_odbc_support" != "xno"; then
@@ -545,6 +548,8 @@ case "$host" in
     ;;
 esac
 
+AM_CONDITIONAL([PLATFORM_MACOSX],[test "x$is_macosx" == "xyes"])
+
 APR_REMOVEFROM(SWITCH_AM_CXXFLAGS, -std=c99)
 
 AC_SUBST(SWITCH_AM_CFLAGS)