Find ABI-compatible versions of MinGW only

[Yaron Keren]

With the new update to the ABI, we should not look for installations of
MinGW older than 4.7 with incompatible C++ libraries.

This patch make clang search for the latest versions of the 4.7 and 4.8 gcc
branches : 4.7.3 and 4.8.1.

Yaron
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Index: tools/clang/lib/Frontend/InitHeaderSearch.cpp
===================================================================
--- tools/clang/lib/Frontend/InitHeaderSearch.cpp	(revision 197168)
+++ tools/clang/lib/Frontend/InitHeaderSearch.cpp	(working copy)
@@ -395,26 +395,12 @@
     break;
   case llvm::Triple::MinGW32:
     // mingw-w64 C++ include paths (i686-w64-mingw32 and x86_64-w64-mingw32)
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.0");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.1");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.2");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.3");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.4");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.0");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.1");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.2");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.3");
-    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.0");
+    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.3");
+    AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.8.1");
     // mingw.org C++ include paths
-    AddMinGWCPlusPlusIncludePaths("/mingw/lib/gcc", "mingw32", "4.5.2"); //MSYS
 #if defined(_WIN32)
+    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.7.3");
     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.8.1");
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.6.2");
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.6.1");
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.5.2");
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.5.0");
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.4.0");
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.3.0");
 #endif
     break;
   case llvm::Triple::DragonFly: