Set Clang_FOUND when just libclang found

cmake/modules/FindClang.cmake

@@ -7,10 +7,12 @@
 #
 #  CLANG_LIBCLANG_LIB          - Libclang C library
 #
-#  CLANG_CLANGFRONTEND_LIB     - Clang Frontend Library
-#  CLANG_CLANGDRIVER_LIB       - Clang Driver Library
+#  CLANG_CLANGFRONTEND_LIB     - Clang Frontend (C++) Library
+#  CLANG_CLANGDRIVER_LIB       - Clang Driver (C++) Library
 #  ...
 #
+#  CLANG_LIBS                  - All the Clang C++ libraries
+#
 # Uses the same include and library paths detected by FindLLVM.cmake
 #
 # See http://clang.llvm.org/docs/InternalsManual.html for full list of libraries
@@ -72,7 +74,7 @@ if (LLVM_FOUND AND LLVM_LIBRARY_DIRS)
   FIND_AND_ADD_CLANG_LIB(clangRewriteCore)
 endif()
 
-if(CLANG_LIBS)
+if(CLANG_LIBS OR CLANG_LIBCLANG_LIB)
   set(CLANG_FOUND TRUE)
 else()
   message(STATUS "Could not find any Clang libraries in ${LLVM_LIBRARY_DIRS}")