Patch #413912 from Steve Majewski: Add .m to the list of extensions

    in order to support Objective-C.

unixccompiler.py

@@ -67,7 +67,7 @@ class UnixCCompiler (CCompiler):
     # reasonable common default here, but it's not necessarily used on all
     # Unices!
 
-    src_extensions = [".c",".C",".cc",".cxx",".cpp"]
+    src_extensions = [".c",".C",".cc",".cxx",".cpp",".m"]
     obj_extension = ".o"
     static_lib_extension = ".a"
     shared_lib_extension = ".so"