maint.mk sc_prohibit_always_true_header_tests: bad cd

[Martin von Gagern]

Hi there!

Running "make sc_prohibit_always_true_header_tests" causes a cd
invocation to fail, without make aborting:

> prohibit_always_true_header_tests
> /bin/sh: line 0: cd: ./gnulib/lib: No such file or directory

It would be nice to actually check that $(gnulib_dir) exists, and either
skip the check (like sc_prohibit_always-defined_macros does) or error
out if that dir doesn't exist.

I wonder whether "gnulib" is a sane initial value for that dir. I at
least have gnulib at the root of my source tree, and I somehow got the
impression that many projects might, so "." would be better.

I also wonder whether the "/lib" subdir should be configurable as well.
But there are a lot of hardwired dirs in maint.mk, and if one were to
fix this, one should do so consistently, I think.

Greetings,
 Martin

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