Linking of test_assert to bundled catch2 fails on macOS with gcc

[barracuda156]

/opt/local/bin/g++-mp-12 -pipe -I/opt/local/libexec/openssl3/include -Os -DNDEBUG -I/opt/local/libexec/openssl3/include -isystem/opt/local/include/LegacySupport -isystem/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0 -arch ppc -isysroot /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.6 -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/test_assert.dir/test_assert.cc.o -o test_assert  /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_databases_tiledb/tiledb/work/build/externals/install/lib/libCatch2Main.a /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_databases_tiledb/tiledb/work/build/externals/install/lib/libCatch2.a 
Undefined symbols:
  "__ZN5Catch11StringMakerIivE7convertEi", referenced from:
      __ZNK5Catch10BinaryExprIiiE29streamReconstructedExpressionERSo in test_assert.cc.o
      __ZNK5Catch10BinaryExprIiiE29streamReconstructedExpressionERSo in test_assert.cc.o
  "__ZN5Catch29formatReconstructedExpressionERSoRKSsNS_9StringRefES2_", referenced from:
      __ZNK5Catch10BinaryExprIiiE29streamReconstructedExpressionERSo in test_assert.cc.o
ld: symbol(s) not found

[barracuda156]

Another linking failure with catch2: #4590