makeparallel: improve support for wrapping ninja
Allow makeparallel to pass better -j and -k arguments to ninja if the
first argument to makeparallel is --ninja. Uses getopt to parse
MAKEFLAGS to get values for --jobserver-fds, -k, and -j, and uses the
result to not pass any -j argument to ninja for make -j with no number,
and pass -k0 to ninja for make -k.
Also improve the test makefile to provide many more tests.
Bug: 24199503
Change-Id: Id6481430f77e9e952213be58a98fe78c46ee5d6a
3 files changed