devenv.sh: export CC, CXX, AR as full paths

they should be the native toolchain (not cross compile or so...)

bash_profile.d/devenv.sh

@@ -74,5 +74,9 @@ function heck_dev_env {
   heck_dev_prefix /Users/heck/local
 }
 
+# GNU MAKE Special var for implicit rules
+export CC=/opt/local/bin/clang
+export CXX=/opt/local/bin/clang++
+export AR=/opt/local/bin/ar
 
 heck_dev_env