build: fix 'gas_version' check on localized environments
Some GNU assembler versions got localized outputs like...
Gnu assembler versão 2.30 (x86_64-linux-gnu) usando versão BFD (GNU Binutils for Ubuntu) 2.30
failing regex checker and the whole configure process.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines