- 3rdparty/libjasper/jas_getopt.c:129:25: warning: this function declaration is not a prototype [-Wstrict-prototypes]
- clang: warning: optimization flag '-fomit-frame-pointer' is not supported for target 'armv7' [-Wignored-optimization-argument]
- clang: warning: optimization flag '-fomit-frame-pointer' is not supported for target 'armv7s' [-Wignored-optimization-argument]
- backport IOS_ARCH toolchain option and setup CMAKE_SYSTEM_PROCESSOR:
  - adds '-mfpu=neon' compiler flag for ARM, SSE flags for i386/x86_64
  - fixed proper libpng compilation (no ARM asm)