uClibc: Add uClibc patch to fix MIPS64/n64 interpreter

uClibc picks the wrong interpreter for MIPS64/n64.
This patch fixes this problem by checking the selected
MIPS ABI instead of the MIPS variant.

The patch has been committed upstream:
http://git.uclibc.org/uClibc/commit/?id=603af30d6992e94ac30a66b953264076f4f2fd71



Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>