Change __MINGW to __MINGW32__.  Patch submitted by Henrik Bach.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20243 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Signals.inc b/lib/System/Win32/Signals.inc
index afe6c8d..55e2d2d 100644
--- a/lib/System/Win32/Signals.inc
+++ b/lib/System/Win32/Signals.inc
@@ -15,7 +15,7 @@
 #include <stdio.h>
 #include <vector>
 
-#ifdef __MINGW
+#ifdef __MINGW32__
 #include <imagehlp.h>
 #else
 #include <dbghelp.h>