Remove now unused build script. am: df04e18be8 am: e65ea6bc5e am: d8753affa1 am: 9eecb0f05f

Original change: https://android-review.googlesource.com/c/platform/tools/ndkports/+/1897333

Change-Id: I78ee3718ba8fe99d11c7d6e1dbe0395ffbba5bfe