Use ld.orig if present to build valgrind rather than making user switch back to ld.orig manually.
Use ld.orig if present to build valgrind rather than making user switch back to ld.orig manually.

BUG=https://bugs.kde.org/show_bug.cgi?id=193413
TEST=script should build working valgrind even if user installed gold with install-build-deps.sh

Review URL: http://codereview.chromium.org/159218

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@21315 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser