build: Update ax_prog_cc_for_build.m4 with upstream

westes / flex

The Fast Lexical Analyzer - scanner generator for lexing in C and C++

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Closed Explorer09 closed 2 weeks ago

Explorer09 commented 2 weeks ago

The ax_prog_cc_for_build.m4 module from upstream contains a typo fix. Beyond that, there are no code changes.

(Follow-up of #649)