CMake: Fix mingw32 build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113676 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 6291ad1..52864d2 100755
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -78,16 +78,18 @@
       target_link_libraries( ${name} ${lib} )
     endforeach(lib)
   endif( LLVM_USED_LIBS )
-  get_system_libs(llvm_system_libs)
-  if( llvm_system_libs )
-    target_link_libraries(${name} ${llvm_system_libs})
-  endif()
   if( LLVM_COMMON_DEPENDS )
     add_dependencies( ${name} ${LLVM_COMMON_DEPENDS} )
   endif( LLVM_COMMON_DEPENDS )
   if (LLVM_COMMON_LIBS)
     target_link_libraries(${name} ${LLVM_COMMON_LIBS})
   endif()
+  if( NOT MINGW )
+    get_system_libs(llvm_system_libs)
+    if( llvm_system_libs )
+      target_link_libraries(${name} ${llvm_system_libs})
+    endif()
+  endif()
 endmacro(add_llvm_executable name)