Log Message:
Update to 1.5.1beta08. Integrates a better version of patch-ac and tries
to fix the Solaris build problem reported in PR 44428.

Version 1.5.1beta07 [January 22, 2011]
  In the manual, describe the png_get_IHDR() arguments in the correct order.
  Added const_png_structp and const_png_infop types, and used them in
    prototypes for most png_get_*() functions.

Version 1.5.1beta08 [January 23, 2011]
  Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
  Added synopses for the IO_STATE functions and other missing synopses
    to the manual. Removed the synopses from libpngpf.3 because they
    were out of date and no longer useful.  Better information can be
    obtained by reading the prototypes and comments in pngpriv.h
  Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
    Added a make macro DFNCPP that is a CPP that will accept the tokens in
    a .dfn file and adds configure stuff to test for such a CPP.  ./configure
    should fail if one is not available.
  Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
  Added png_get_current_row_number and png_get_current_pass_number for the
    benefit of the user transform callback.
  Added png_process_data_pause and png_process_data_skip for the benefit of
    progressive readers that need to stop data processing or want to optimize
    skipping of unread data (e.g., if the reader marks a chunk to be skipped.)