fix up chromium m47 build error: unsupported reloc 42 against global symbol gmon_start

Errong Leng -

Error:
ld.gold: error: /usr/lib/gcc/x86_64-linux-gnu/5.3.1/../../../x86_64-linux-gnu/crti.o: unsupported reloc 42 against global symbol gmon_start

Solution:
export GYP_DEFINES="linux_use_bundled_gold=0"