patch(1): avoid line number overflows

Introduce strtolinenum to properly check line numbers while parsing:
no signs, no spaces, just digits, 0 <= x <= LONG_MAX

Properly validate line ranges supplied in diff file to prevent overflows.
Also fixes an out of boundary memory access because the resulting values
are used as array indices.

PR:	195436
Obtained from:	OpenBSD (CVS pch.c rev 1.45, 1,46, common.h rev 1.28)
MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275612 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f