configure.ac: C99 compatibility fixes

waltligon / orangefs

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configure.ac: C99 compatibility fixes #99

Open fweimer-rh opened 1 year ago

fweimer-rh commented 1 year ago

Avoid implicit function declarations and implicit int, for improved compatibility with future compilers which no longer support these language features by default.

Related to:

https://fedoraproject.org/wiki/Changes/PortingToModernC
https://fedoraproject.org/wiki/Toolchain/PortingToModernC