Update pngcrush to 1.4.8.

Changes include:

Version 1.4.8
 * Detect and remove all-opaque alpha channel.
 * Detect and reduce all-gray truecolor images to grayscale.

Version 1.4.7
 * Restored the "-ext" option that was inadvertently overridden
   with a new "-exit" option in version 1.4.6 ("-exit" is used to
   force an "exit" instead of a "return" from the main program).

Version 1.4.6
 * Fixed bug in color-counting of noninterlaced images.
 * Added capability of processing multiple rows at a time
   (disabled by default because it turns out to be no faster).
 * Replaced "return" statements in main() with "exit" statements.
   User can force exit instead of return with "-exit" argument.
 * Added the UCITA disclaimers to the help output.

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