Update libpng to 1.0.11.

pkgsrc change: bump shared library major like it happened in libpng some
time ago -- our libtool'ified build didn't reflect this. Fixes pkg/12856
by Thor Simon. Note necessity of manual major/minor handling in Makefile,
to decrease chance that this will repeat in the future.
Changes since 1.0.10:
  Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
  Removed a no-longer needed AIX work-around from pngconf.h
  Changed several "//" single-line comments to C-style in pnggccrd.c
  Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
  Updated scripts/pngos2.def
  Added a check for NULL return from user's malloc_fn().
  Removed some useless type casts of the NULL pointer.
  Added makefile.netbsd [not used, since we're using libtool instead]

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