Fix typos on LLVM.cmake. Export LLVM_ON_UNIX & LLVM_ON_WIN32.

Patch by arrowdodger!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128789 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/LLVM.cmake b/cmake/modules/LLVM.cmake
index 9182afd..8afc63d 100644
--- a/cmake/modules/LLVM.cmake
+++ b/cmake/modules/LLVM.cmake
@@ -20,10 +20,10 @@
 
 set(LLVM_ENABLE_PIC @LLVM_ENABLE_PIC@)
 
-set(LLVM_ENABLE_THREADS @LLVM_ENABLE_THREADS)
-
 set(HAVE_LIBDL @HAVE_LIBDL@)
-set(HAVE_LIBPTHREAD @HAVE_LIBPTHREAD)
+set(HAVE_LIBPTHREAD @HAVE_LIBPTHREAD@)
+set(LLVM_ON_UNIX @LLVM_ON_UNIX@)
+set(LLVM_ON_WIN32 @LLVM_ON_WIN32@)
 
 # We try to include using the current setting of CMAKE_MODULE_PATH,
 # which suppossedly was filled by the user with the directory where