Revert "linker: remove STB_LOCAL hack"

This reverts commit 61ff83475c6f3a3bb05a01ac89d668a331bfe9e9.

This code is harmless, and only applies to the linker, so
there's no harm in keeping it in the tree a little bit longer.
Let's roll this back while we try to figure out the root cause
of bug 6314858.

Bug: 6314858
Change-Id: I9f5ed81d23a7abe273baf792aa8a0a2839ef094c
1 file changed