Fix build : Force ld.gold binary usage

Use the one from chroot instead of the one provided by Chromium third party

Use traditionnal binary from Chromium thirdparty leads to build faillure

[  188s] [911/10836] CC obj/third_party/freetype2/src/src/base/freetype2.ftbase.o
[  188s] [912/10836] LINK genmodule
[  188s] FAILED: cc -Wl,--no-keep-memory -Wl,-z,now -Wl,-z,relro -pthread -Wl,-z,noexecstack -fPIC -B/home/abuild/rpmbuild/BUILD/crosswalk/src/third_party/binutils/Linux_x64/Release/bin -Wl,--disable-new-dtags -m64 -Wl,--icf=none -fuse-ld=gold -Wl,-O1 -Wl,--as-needed -Wl,--gc-sections -o genmodule -Wl,--start-group obj/third_party/yasm/source/patched-yasm/libyasm/genmodule.genmodule.o  -Wl,--end-group
[  188s] collect2: fatal error: cannot find 'ld'

BUG=https://crosswalk-project.org/jira/browse/XWALK-1904

Also extend fix for XWALK-1379

BUG=https://crosswalk-project.org/jira/browse/XWALK-1379
Signed-off-by: Baptiste DURAND <baptiste.durand@open.eurogiciel.org>