golang.org/cl/16383 broke android/386 because by a sort of confluence of hacks
no TLS relocations were emitted at all when Flag_shared != 0. The hack in
runtime/cgo works as well in a PIE executable as it does with a position
dependent one, so the simplest fix is to still emit a R_TLS_LE reloc when goos
== "android".

A real fix is to use something more like the IE model code but loading the
offset from %gs to the thread local storage from a global variable rather than
from a location chosen by the system linker (this is how android/arm works).

Issue #9327.

Change-Id: I9fbfc890ec7fe191f80a595b6cf8e2a1fcbe3034
Reviewed-on: https://go-review.googlesource.com/17049Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>