[devel] Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED.
This allows the functions to read and write ints to be disabled independently of PNG_USE_READ_MACROS, which allows libpng to be built with the functions even though the default is to use the macros - this allows applications to choose at app build time whether or not to use macros (previously impossible because the functions weren't in the default build.)
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