It fails to compile webkit when default tune is 'mips':
| .../tmp-glibc/work/mips-wrs-linux/webkitgtk/2.24.2-r0/webkitgtk-2.24.2
| /Source/JavaScriptCore/assembler/MacroAssemblerMIPS.h:418:23:
| error: static assertion failed: CLZ opcode is not available for this ISA
So don't build webkit when default tune is mips.
Signed-off-by: Kai Kang <kai.kang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>