Follow-up Comment #4, bug #56449 (project make):
It is true that %Path% on a command line should expand to the value of Path in
the environment. It is also true that to have this expansion, we need to
invoke the command through the shell. However, this is only true for any
arbitrary %FOO% where an environment variable FOO is defined. If FOO is not
defined, then %FOO% is expanded to just %FOO%, i.e. is not changed at all. In
particular, %% is left alone by the shell.
So to support %FOO% expansion correctly, we need to figure out whether FOO is
defined or not. IOW, we need to call 'getenv', at least. And even that might
not be 100% accurate, since the command could modify the environment as part
of itself (but maybe we should ignore this possibility, even if it exists).
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