[Ready for test/1.5.1] libpng (many)

[Charles Wilson]

libpng-1.0.15-3
libpng10-1.0.15-3
libpng10-devel-1.0.15-3

libpng-1.2.5-3
libpng12-1.2.5-3
libpng12-devel-1.2.5-3

* recompiled against cygwin-1.5.1 kernel
* documentation moved to /usr/share/*
--
  Charles Wilson
  cygwin at removespam cwilson dot fastmail dot fm