let configure do the libdir insert and not the environment

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7683 d0543943-73ff-0310-b7d9-9358b9ac24b2

build/modmake.rules.in

@@ -26,8 +26,8 @@ DEFS=@DEFS@
 PREFIX = @prefix@
 MODINSTDIR = @modinstdir@
 
-DYLD_LIBRARY_PATH=${_libdir}:$DYLD_LIBRARY_PATH
-LD_LIBRARY_PATH=${_libdir}:$LD_LIBRARY_PATH
+DYLD_LIBRARY_PATH=@libdir@:$DYLD_LIBRARY_PATH
+LD_LIBRARY_PATH=@libdir@:$LD_LIBRARY_PATH
 OSARCH=`uname -s`
 DYNAMIC_LIB_EXTEN = @DYNAMIC_LIB_EXTEN@
 SOLINK = @SOLINK@