Update build-tools to ab/4581524

Kati update for $(shell) speed debugging and recognizing
build/make/tools/findleaves.py

Test: m
Change-Id: Ic575b059effffded1532c0a9c36b974f5f0caa66
12 files changed
tree: b8f31ba479b442545f3071df1083f2b2fffbf781
  1. common/
  2. darwin-x86/
  3. linux-x86/
  4. build-prebuilts.sh
  5. manifest.xml
  6. OWNERS