For PR784:
Support Win32 platforms for llvm-gcc path. Patch by Anton Korobeynikov


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28426 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index 9b0e36e..ca2049f 100755
--- a/configure
+++ b/configure
@@ -3150,7 +3150,7 @@
 fi;
 case "$withval" in
   default) WITH_LLVMGCCDIR=default ;;
-  /*)      WITH_LLVMGCCDIR=$withval ;;
+  /* | [A-Za-z]:[\\/]*)      WITH_LLVMGCCDIR=$withval ;;
   *) { { echo "$as_me:$LINENO: error: Invalid path for --with-llvmgccdir. Provide full path" >&5
 echo "$as_me: error: Invalid path for --with-llvmgccdir. Provide full path" >&2;}
    { (exit 1); exit 1; }; } ;;