webkit-webos: Drop invalid test for gold and add -g1

* gold is enabled by default when DISTRO_FEATURES contain ld-is-gold
* When building for qemux86-64 and with newer oe-core which has binutils
  2.23 instead of 2.22 (version used in danny release)
  x86_64-webos-linux-ar r libWebCore.a fails with
    x86_64-webos-linux-ar: libWebCore.a: File truncated
  because libWebCore.a is bigger then 4GB.
  Please notice that this error is slightly different then when building
  with less then 6GB RAM available on host, but both show "File truncated"
  but this time there isn't any OOM killer in dmesg.
  More info in http://sourceware.org/bugzilla/show_bug.cgi?id=14625
* One way to fix that is to disable building of symbol table (add 'S' to
  ar call), but building with g1 reduces libWebCore.a size under 4GB and
  also makes sstate-archives significantly smaller.
  511M sstate-webkit-webos-qemux86_64-webos-linux-1.3-0.54-r11-qemux86_64-2-33cd8c9f52cd56ef1b0572888c959853_populate-sysroot.tgz
  518M sstate-webkit-webos-qemux86_64-webos-linux-1.3-0.54-r11-qemux86_64-2-f3e6bcbed84d050293680a8303a8e090_deploy-ipk.tgz
  1.1G sstate-webkit-webos-qemux86_64-webos-linux-1.3-0.54-r11-qemux86_64-2-f99571860a3aafc00c80170a02f4122c_package.tgz

   18M sstate-webkit-webos-qemux86_64-webos-linux-1.3-0.54-r11-qemux86_64-3-4db3982e045928c0e16c8edfc2ee04bc_populate-sysroot.tgz
   18M sstate-webkit-webos-qemux86_64-webos-linux-1.3-0.54-r11-qemux86_64-3-2993c46bb7b53df14d0d09505edd7b67_deploy-ipk.tgz
   18M sstate-webkit-webos-qemux86_64-webos-linux-1.3-0.54-r11-qemux86_64-3-6671d8318c9ad38dd7ba05601ff7428d_package.tgz

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: If806266716f28622a61ac83e82120fa1607a89c3

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>