[Issue 127712] Allow building when gcc -dumpversion does not use the canonical x.y.z format

[bugzilla]

https://bz.apache.org/ooo/show_bug.cgi?id=127712

--- Comment #3 from Andrea Pescetti <pesce...@apache.org> ---
Very nice solution! If old gcc versions indeed behave like this and simply
ignore the option they don't support (when given both), then please feel free
to turn this into a patch against trunk, attach it here, and I will commit it
for you.

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