build: drop the use of XC_AMEND_DISTCLEAN

Because automake used to delete depdirs at once (.deps) and there was an issue
with portability, curl's XC_AMEND_DISTCLEAN greps the Makefiles in an attempt
to build a list of all depfiles and delete them individually instead.

Since commit 08849db866b44510f6b8fd49e313c91a43a3dfd3, automake switched from
deleting directories to individual files. curl's custom logic now finds a lot
more results with the grep (the filtering of these results isn't great), which
causes a massive bloating of the Makefile in the order of O(n^2).

Also remove now-unused XC_AMEND_DISTCLEAN macro group

References: https://github.com/curl/curl/issues/9843
References: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=59288

Reported-by: Ilmari Lauhakangas
Fixes #9843
Closes #10661

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