Commits on Jan 27, 2024

1. Don't try to use nonexistent libpng optimizations …

   The embedded copy of libpng doesn't contain code for processor-specific
   hardware optimizations, but it may still try to use them in some cases,
   resulting in linker errors.
   
   juce_PNGLoader.cpp already sets `PNG_ARM_NEON_OPT` to 0 to disable
   optimizations on ARM, but this should be done for all architectures,
   especially PowerPC, where builds currently fail.
   
   On x86, this isn't strictly necessary, because libpng optimizations are
   opt-in for x86, rather than opt-out as with all other architectures, but
   for completeness and robustness it is also included here.
   
   The macros to disable optimizations on other platforms come straight
   from libpng's own build files; this is how it disables optimizations
   when compiled without support for them. `PNG_ARM_NEON_OPT` is already
   one of those macros; this commit simply adds the other three.

   

   taylordotfish committed Jan 27, 2024
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