Use CMAKE_DL_LIBS instead of raw library name. Fixes bug 5536.

Patch by Tobias Grosser!

llvm-svn: 89406
diff --git a/llvm/cmake/modules/LLVMConfig.cmake b/llvm/cmake/modules/LLVMConfig.cmake
index d1c297c..a753674 100755
--- a/llvm/cmake/modules/LLVMConfig.cmake
+++ b/llvm/cmake/modules/LLVMConfig.cmake
@@ -5,7 +5,7 @@
       set(system_libs ${system_libs} imagehlp psapi)
     elseif( CMAKE_HOST_UNIX )
       if( HAVE_LIBDL )
-	set(system_libs ${system_libs} dl)
+	set(system_libs ${system_libs} ${CMAKE_DL_LIBS})
       endif()
       if( LLVM_ENABLE_THREADS AND HAVE_LIBPTHREAD )
 	set(system_libs ${system_libs} pthread)