[CMake] Use MATCHES for regular expression.

Subscribers: mgorny

Differential Revision: https://reviews.llvm.org/D35514

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@308347 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CMakeLists.txt

@@ -258,7 +258,7 @@ if (LIBCXX_ENABLE_STATIC)
       set(MERGE_ARCHIVES_SEARCH_PATHS "-L${LIBCXX_CXX_ABI_LIBRARY_PATH}")
     endif()
     if ((TARGET ${LIBCXX_CXX_ABI_LIBRARY}) OR
-        (${LIBCXX_CXX_ABI_LIBRARY} STREQUAL "cxxabi(_static|_shared)?" AND HAVE_LIBCXXABI))
+        (${LIBCXX_CXX_ABI_LIBRARY} MATCHES "cxxabi(_static|_shared)?" AND HAVE_LIBCXXABI))
       set(MERGE_ARCHIVES_ABI_TARGET "$<TARGET_LINKER_FILE:${LIBCXX_CXX_ABI_LIBRARY}>")
     else()
       set(MERGE_ARCHIVES_ABI_TARGET