[legacy] Updated ANNOUNCE
[legacy] Bump version to libpng-1.2.47beta01
[legacy] Updated contrib/pngminus/makefile.std
[legacy] Reverted non-portable GNU syntax in makefile (?=, +=)
[legacy] Deleted some extra blank lines from visualc6 and 71 README files.
[libpng12] Imported from libpng-1.2.47rc01.tar

Conflicts:

	pngrutil.c

Change-Id: Ifd7066fe002e1dbd257b738ad075996e7a5c5fb8
[libpng12] Imported from libpng-1.2.47.tar
[libpng12] Bump version to 1.2.48beta01
[libpng12] Removed two useless #ifdef directives from pngread.c and

one from pngrutil.c
[libpng12] Eliminated redundant png_push_read_tEXt|zTXt|iTXt|unknown code from

    pngpread.c and use the sequential png_handle_tEXt, etc., in pngrutil.c;
    now that png_ptr->buffer is inaccessible to applications, the special
    handling is no longer useful.
[libpng12] Fixed bug with png_handle_hIST with odd chunk length (Frank Busse).
[libpng12] Fixed off-by-one bug in png_handle_sCAL() when using fixed point

arithmetic, causing out-of-bounds read in png_set_sCAL() because of failure
to copy the string terminators (Franke Busse).
[libpng12] Imported from libpng-1.2.48beta01.tar
[libpng12] Bump version to 1.2.48beta02
[libpng12] Removed png_free() of unused png_ptr->current_text from pngread.c.
[libpng12] Added libpng license text to pnggccrd.c and pngvcrd.c

(requested by Chrome).
[libpng12] Imported from libpng-1.2.48rc02.tar
[libpng12] Update ANNOUNCE about pnggccrd.c change
[libpng12] Fixed date in ANNOUNCE.
[libpng12] Imported from libpng-1.2.48.tar