Fix endianness check
Fix endianness check

The big endian check looked for __ppc__ and __POWERPC__, but ppu-gcc
defines __PPC__ and __powerpc__ (note difference in case).  Add those
symbols as well to the check.

cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT,cebash/SDL_PSL1GHT