StdLib: Improve robustness of stat() and make basename() a public function.

AppPkg: Refinements to pyconfig.h and port of getpath.c to EDK II.

Signed-off-by: darylm503
Reviewed-by: geekboy15a
Reviewed-by: jljusten


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12508 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/Include/sys/EfiSysCall.h

@@ -291,7 +291,7 @@ __BEGIN_DECLS
 
     @return
   **/
-  int     stat      (const char *, void *);
+  int     stat      (const char *, struct stat *);
 
   /**
     @param[in]