Fix config.h endianess detection to work on Linux / PPC64.
Config.h performs endianess detection including OS-specific headers to define the endianess macros, or when this is not possible, checking the processor type via ifdefs. Sometimes when the OS-specific macro is included, only __BYTE_ORDER is defined, while BYTE_ORDER remains undefined. There is code at the end of config.h endianess detection in order to define the macros without the underscore, but it was not working correctly. This commit fixes endianess detection fixing Redis on Linux / PPC64 and possibly other systems.
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