we need DYNAMIC_LIB_EXTEN for mod_perl and others

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13023 d0543943-73ff-0310-b7d9-9358b9ac24b2

build/modmake.rules.in

@@ -29,6 +29,7 @@ MODINSTDIR = @modinstdir@
 DYLD_LIBRARY_PATH=@libdir@:$DYLD_LIBRARY_PATH
 LD_LIBRARY_PATH=@libdir@:$LD_LIBRARY_PATH
 OSARCH=`uname -s`
+DYNAMIC_LIB_EXTEN = @DYNAMIC_LIB_EXTEN@
 LIBTOOL_LIB_EXTEN = @LIBTOOL_LIB_EXTEN@
 SOLINK = @SOLINK@