Merge bitcoin/bitcoin#31366: cmake: Check -Wno-* compiler options f…

…or `leveldb` target

9e4a4b4 cmake: Check `-Wno-*` compiler options for `leveldb` target (Hennadii Stepanov)

Pull request description:

  Otherwise, https://cirrus-ci.com/task/4830737755537408:
  ```
  At global scope:
  cc1plus: note: unrecognized command-line option ‘-Wno-conditional-uninitialized’ may have been intended to silence earlier diagnostics
  ```

ACKs for top commit:
  TheCharlatan:
    ACK 9e4a4b4

Tree-SHA512: 05553c80399180e01d45c3f02074ca0ce620011b29b03bef5433b87c9d88fd281fb6bf0203fc6fff590f3780c182a3fab8307002536b6350e03748420c346602

cmake/leveldb.cmake

@@ -87,9 +87,11 @@ if(MSVC)
     _CRT_NONSTDC_NO_WARNINGS
   )
 else()
-  target_compile_options(nowarn_leveldb_interface INTERFACE
-    -Wno-conditional-uninitialized
-    -Wno-suggest-override
+  try_append_cxx_flags("-Wconditional-uninitialized" TARGET nowarn_leveldb_interface SKIP_LINK
+    IF_CHECK_PASSED "-Wno-conditional-uninitialized"
+  )
+  try_append_cxx_flags("-Wsuggest-override" TARGET nowarn_leveldb_interface SKIP_LINK
+    IF_CHECK_PASSED "-Wno-suggest-override"
   )
 endif()