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Build: configure: make compatible with autoconf 2.70

Description

Build: configure: make compatible with autoconf 2.70

It's never been supported to use shell control constructs like if and case
with m4 macros inside, but changes in autoconf 2.70 made it more likely to
cause problems, so use AS_IF() and AS_CASE() wherever appropriate.

Also, avoid newly obsolete syntax.

Details

Provenance
kgaillotAuthored on Jan 6 2021, 10:41 AM
Parents
rP39dfd6db57f9: Build: configure: move version.m4 to m4 subdirectory
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