Fixed format warnings: format not a string literal and no format arguments
Fixed another buffer security warning
Fixed bug 2578 - No transparency in XPM files

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SDL_image 1.2.12 loads the attached XPM file with transparency.

SDL_image 2.0.0 now uses a white background instead.
Use xcrun to find CpMac
Updated config.sub with NaCl configuration
Updated config.guess to match config.sub
Fixed code signing release frameworks
Fixed supporting multiple frameworks
Strip the binaries before signing them, in release configuration
Workaround for bogus bitmasks used by ImageMagic and the GIMP
Fixed bug 1912 - png_const_bytep should not be used in libpng >= 14
Removed duplicate typedef
Bug 1912 was already fixed, and the last change broke building with libpng 1.5.
Passing 0 returns the previously initialized loaders, but if specific loaders were requested, return the set of them that were initialized.