community/netpbm: upgrade to 11.5.1

https://sourceforge.net/p/netpbm/code/HEAD/tree/advanced/doc/HISTORY

23.12.28 BJH Release 11.05.01

          Fix typo in ppmforge test case.

23.12.28 BJH Release 11.05.00

          pnmpad: Add -color, -promote, -extend-edge, -detect-background .

          pnmconvol: Restore ability of convolution matrix to be a
          pseudo-plain-PNM with samples that exceed the maxval.  Lost in
          10.30 (October 2005) because maxval-checking code was added to
          libnetpbm.  (Was fixed in 10.47.08 in November 2010, but only in
          the 10.47 series).

          pnmindex: Improve failure mode when -size or -across is zero.

          pnmindex: Make -plain work.

          pnmpad: fix behavior with -left, -right, and -width together or
          -top, -bottom, -height together: ignores -width where it should
          fail.  Broken in Netpbm 10.72 (September 2015).

          pamtosvg: fix "zero determinant" failure.  Introduced in
          Netpbm 11.04 (September 2023).

          pjtoppm: fix crash based on uninitialized variable.
          Introduced in Netpbm 11.04 (September 2023).

          ppmtopcxl: fix incorrect output with > 256 colors.  Always
          broken.  (Program was added in primordial Netpbm in 1990).

          pbmtext: fix buffer overrun with insanely large input.

          picttoppm: fix buffer overrun with insanely wide input.

          ppmtoxpm: fix incorrect output with insanely large number of
          colors.

          pnmscalefixed: fix incorrect output with really big image and
          -pixels option.

          ppmdither: fix buffer overrun with insanely large dithering
          matrix.

          pnmpad: no longer accept old-style options (e.g. -t50).

          libnetpbm: Add pm_feed_from_file, pm_accept_to_files,
          pm_accept_to_filestream Standard Input feeder, Output accepter
          for pm_system.

          libnetpbm, programs that use color maps: fix buffer overrun
          with insanely deep images.

          merge build: Fix 'pnmcat'.  Introduced in Netpbm 11.00
          (September 2023).

          Build: Fix compile error on systems without 'asprintf'.
          Introduced in Netpbm 11.04 (September 2023).

          Build: Fix building of jpeg2ktopam and pamtojpeg2k with
          assertion checking by default.