lib/raid6: fix makefile compatibility with a non-gnu awk

fixes compilation issues manifested as:
 awk: can't open file -vN=1
 WARNING: could not open lib/raid6/int1.c: No such file or directory

Signed-off-by: Petri Ahonen <peahonen@gmail.com>
ARM: zImage: use size for target architecture

fixes compilation issues manifested as:
 size: file: arch/arm/boot/compressed/../../../../vmlinux is not an object file
 --defsym:1: undefined symbol `__OBJC' referenced in expression

Signed-off-by: Petri Ahonen <peahonen@gmail.com>