Add 32-bit libwinpthread-1.dll to windows toolchain dependencies.

Bug: http://b/34273721

  - Copy 32-bit libwinpthread-1.dll from
    prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8.
  - Corresponding build script change in a separate CL:
    https://android-review.googlesource.com/322278

Test: manually tested llvm-rs-cc.exe and bcc_compat.exe on windows.

Change-Id: Ib0c3f98734c68e174fd614f3940b706e25e945d7
(cherry picked from commit 5df9f20565e63906167c82f6120c78e969b3b467)
1 file changed
tree: 0662fa8f0b6ac6410647d49e89ba11a6c8f9e9e2
  1. current/