Avoid adding redundant temporary RUNPATH to builder's stdlib
Many shared libs and executables are only run after stdlib/runtime are
built. They don't need to link with builders stdlib at all.
(cherry picked from commit 2a2787b2d0cdd45486e98a7cf19da4208b9ebb61)
(cherry picked from commit 16bf7a399970e639707706e956bfb5ead75750b7)
