Bug#832957: Warning: versions are different between png.h and png.c

[積丹尼 Dan Jacobson]

Package: pngcrush
Version: 1.7.85-1+b1
Severity: minor

Each run one sees:
Warning: versions are different between png.h and png.c
  png.h version: 1.6.21
  png.c version: 1.6.23