- Add patch to fix build with png >= 1.6.42:
  * 0001-Check-for-defined-PNG_IGNORE_ADLER32.patch
- Spec cleanup (forwarded request 1160431 from krop)

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- Update to new upstream release 1.8.13:
  * Made "-reduce" the default behavior.  Removed obsolete options
    "-plte_len", "-cc", "-nocc", "-double_gamma", "-already_crushed",
    and "-bit_depth".
  * Added "-speed" option; it avoids using the AVG or PAETH filters
    which are slower to decode.
  * Made "-force" force output even when the IDAT is larger, and
    added "-noforce" option; "-noforce" is now the default behavior.
  * Added "-warn" option, to show only warnings.
  * Changed default verbosity from 1 (normal) to 0 (quiet). Use "-v"
    to get the previous default behavior and "-v -v" to get the
    previous "verbose" behavior. The "-s" (silent) and "-q" (quiet)
    options behave as before.
- Remove pngcrush-systemlib.diff: not needed anymore.
- Add package source verification. (forwarded request 539164 from vilene)

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 (forwarded request 460619 from StefanBruens)

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1

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- updated to 1.7.85
  - Improved reporting of invalid chunk names. Does not try to put
    non-printable characters in STDERR; displays hex numbers instead.
  - Fixed include path for utime.h on MSVC (Louis McLaughlin).
  - Eliminated "FAR" memory support (it was removed from libpng at version 1.6.0).
  - Disabled the "-already_crushed" option which does not really work well.

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