Update patch to the version used by DragonFly and derived from OpenBSD.
Major changes are:
- better detection of double applied patches
- rejects remain unified diffs for unified patches
- far less l

Update patch to the version used by DragonFly and derived from OpenBSD.
Major changes are:
- better detection of double applied patches
- rejects remain unified diffs for unified patches
- far less limitations, e.g. patch lines may be arbitrary long

This addresses PR standards/11220 by changing patch -b behavior to be
POSIX compliant. Old behavior can be obtained using --suffix, which
works since NetBSD 1.4. pkgsrc has been adjusted accordingly.

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