header files. It defines MACHINE_ENDIAN which is one of three values:
little, big, or unknown.
This file is used in package Makefiles as follows:
.include "../../mk/endian.mk"
.if ${MACHINE_ENDIAN} == "big"
# ...big endian stuff...
.elif ${MACHINE_ENDIAN} == "little"
# ...little endian stuff...
.else
BROKEN= "Unknown endianness"
.endif