a68: fix portability problems in sppp.awk

Happy new year!

Turns out the optional third argument of 'match' is a GNU extension
and is not POSIX.  Also, POSIX doens't recognize interval expressions
in regexps.

This patch vandalizes sppp.awk to remove the use of these nonportable
(but nice) constructs.

Tested with mawk.

Signed-off-by: Jose E. Marchesi <jemarch@gnu.org>

libga68/ChangeLog

	* sppp.awk: Fix non-portable uses of 'match'.
1 file changed