Disable 32-bit host builds

All of our outputs are 64-bit builds, and 32-bit is going away for
Darwin, so just remove it in all cases.

Test: prebuilts/clang-tools/build-prebuilts.sh
Change-Id: I32ea0a7649a136ab76379346ee8856eb06e6cd26
1 file changed
tree: 372e58bca20e09d8e2f87377b0de220c3568fafc
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml