Turn on LLVM_ENABLE_PLUGINS by default on Windows

Reviewers: rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D16760

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260262 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/HandleLLVMOptions.cmake

@@ -671,7 +671,7 @@ endif()
 
 # Plugin support
 # FIXME: Make this configurable.
-if(WIN32 OR CYGWIN)
+if(CYGWIN)
   if(BUILD_SHARED_LIBS)
     set(LLVM_ENABLE_PLUGINS ON)
   else()