Expose libwinpthread-1.dll for the sdk-repo builds am: 61f9308c4d am: 5ff560d6c5 am: bced1aa67b am: 6250582f58

Original change: https://android-review.googlesource.com/c/platform/prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8/+/1827839

Change-Id: I1d00155697ff4bbfa129ff305e86e748f581855f