Avoid bashism in configure.ac

LinuxCNC / linuxcnc

LinuxCNC controls CNC machines. It can drive milling machines, lathes, 3d printers, laser cutters, plasma cutters, robot arms, hexapods, and more.

http://linuxcnc.org/

GNU General Public License v2.0

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Closed petterreinholdtsen closed 1 month ago

petterreinholdtsen commented 1 month ago

Also use consistent notation for appending to CFLAGS and CXXFLAGS.

Fixes #3132.