always use gb_LinkTarget__get_cxxflags for cxxobjects

E.g. gb_LinkTarget_add_exception_object adds it explicitly, but
gb_LinkTarget_add_cxxobject itself does not, even though other variants
(c,objc,objcxx) do it.
This means that when compiling tools/qa/cppunit/test_cpuid.cxx it
doesn't get the correct -O/-g flags, because CppunitTest_tools_test.mk
uses gb_CppunitTest_add_cxxobjects to add $(INTRINSICS_CXXFLAGS).
And that in its own actually should use the add_exception_objects variant,
it didn't presumably because that one used to have cxxflags passing broken
until I fixed it in 4bbdab901eb3c7d32d28910fb830f4b0422eee91. The usage
in Library_cpp_uno.mk even explicitly works around the lack of debug symbols.

Change-Id: Idc794e95bb817cd2ba2942b8e1f04f80d6722f97
Reviewed-on: https://gerrit.libreoffice.org/80119
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

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