Compatibility check for autotools
Compatibility check for autotools

This add an explicit test on the obsolete _MINIX define, unset it and
replace it with _NETBSD_SOURCE.

This should help compile a lot of packages relying on autotools in pkgsrc.

Change-Id: Ie7da4ed5172f1b9f1f89e7a5d788ec2aed4d2563

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi