Statically link libwinpthread into windows binaries.

Statically link libwinpthread.a, so that we don't have to ship a
libwinpthread dll with all of our windows exectuables.

Bug: http://b/31665213
Test: wine adb.exe
Test: wine fastboot.exe
Change-Id: I96414e980d8894f8f6a58c1c7bbd9dc5e0f5169c
3 files changed