[cmake] Normalize LLVM_ENABLE_DIA_SDK to fix Windows tests

Attempts to fix Windows build breakage caused by r290818.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290832 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/config-ix.cmake

@@ -457,6 +457,13 @@ if( MSVC )
   if(LLVM_ENABLE_DIA_SDK AND NOT HAVE_DIA_SDK)
     message(FATAL_ERROR "DIA SDK not found. If you have both VS 2012 and 2013 installed, you may need to uninstall the former and re-install the latter afterwards.")
   endif()
+
+  # Normalize to 0/1 for lit.site.cfg
+  if(LLVM_ENABLE_DIA_SDK)
+    set(LLVM_ENABLE_DIA_SDK 1)
+  else()
+    set(LLVM_ENABLE_DIA_SDK 0)
+  endif()
 else()
   set(LLVM_ENABLE_DIA_SDK 0)
 endif( MSVC )