maintainer-feedback requested: [Bug 237254] textproc/p5-Text-BibTeX: fix build with GCC-based architectures

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Bug 237254: textproc/p5-Text-BibTeX: fix build with GCC-based architectures
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237254



--- Description ---
Building this port fails with:
btparse/tests/namebug.c:193: error: 'for' loop initial declaration used outside
C99 mode
on GCC architectures.

Set USE_CSTD=c99 to fix build.

Tested on powerpc64 and amd64.