configure.ac: make non-executable

it needs to be processed by autoconf or autoreconf, and doesn't have a
suitable shebang to be directly executed. other projects normally set
configure.ac -x.

Closes #7272
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Alex Xu (Hello71) 2021-06-17 09:11:05 -04:00 committed by Daniel Stenberg
parent 6dd35dd3b5
commit d7cc6e2c66
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configure.ac Executable file → Normal file
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