[bug #48643] Irrelevant targets can confuse make on which pattern rule to select.

[Paul D. Smith]

Follow-up Comment #30, bug #48643 (project make):

> Let us list the options
> 1. keep compat search enabled by default and silent.
> 2. introduce a warning message when make begins compat search.
> 3. introduce a flag to disable compat search.
> 4. have compat disabled by default and introduce a flag to enable it.

I added #2 to a local build and ran through a suite of different kinds of open
source software that I build locally, including packages that are built with
home-grown makefiles, automake-generated makefiles, and cmake-generated
makefiles.  I didn't test a Linux kernel build however.  I should probably add
that to my test process.

I didn't see any instances of this warning appear.  So hopefully that suggests
that adding this would not result in a tsunami of warnings.

I'm tempted to add this warning for the release candidates process, and see
whether we get complaints.  Of course we always run into issues after the
release that were not caught during the RC process but...

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