Change MMX ldq_u to return _m64 instead of forcing all callers to cast

Sun/Oracle Studio compilers allow the pointers to be cast, but not the
non-pointer forms, causing pixman compiles to fail with many errors of:
"pixman-mmx.c", line 1411: invalid cast expression

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
1 file changed