Add make prebuilt_build_tool

Although make shouldn't be used to describe or execute any part of the
build graph, some external projects generate code such as configuration
headers using logic embedded in the Makefile, essentially using make as
a scripting language.

Test: local test with proof-of-concept make-based configuration genrule
Bug: 325067608
Change-Id: I1a6396a8e026a7c4f17f12ae2caad932aa54e325
1 file changed