[bug #47880] Allow updates to .INCLUDE_DIRS to change search path

[Paul D. Smith]

Follow-up Comment #8, bug #47880 (project make):

Sorry I guess I wasn't clear.  I wasn't going to remove them by default: the
default behavior and search path won't change under any of these proposals.

I was suggesting that instead of creating a new flag specifically to remove
default includes, we allow users to provide a special version of -I to remove
default includes.  So if users give (in my example) the "-I-" option that
would mean "reset the include search path to empty".

If they didn't given the "-I-" option, then the current behavior including
default search path would be preserved.

It just seems to me that this issue of default include paths is too
minor/rarely problematic to waste an entire command line option on it :).

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