tile: default to little endian on older toolchains
tile: default to little endian on older toolchains

Older toolchains may not specify __LITTLE_ENDIAN__, but older
toolchains were all little endian.  Don't make things unnecessarily
hard for those toolchains.

Signed-off-by: Chris Metcalf <074881f6f5da4d3b5278870ff234d1077ee622c0@ezchip.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs