This adds support for selecting on multiple variables at once, so that
you can do AND/OR combindations of them. For example:
select((
arch(),
os(),
), {
("arm64", "linux"): ["libfoo64"],
(default, "linux"): ["libfoo"],
(default, "windows"): ["libfoowindows"],
(default, default): ["libbar"],
})
It also allows for select conditions to be boolean-typed. You can
write literal true and false without quotes to select on them. Currently
we don't have any boolean-typed variables though, so a fake one was
added for testing.
Bug: 323382414
Test: m nothing --no-skip-soong-tests
Change-Id: Ibe586e7b21865b8734027848cc421594cbd1d8cc
3311debbb3