yawn sigh

https://perl5.git.perl.org/perl5.git?a=search&h=HEAD&st=commit&s=makefile.mk

 2021-01-28    xenu    win32: remove makefile.mk (#18511)
win32: remove makefile.mk (#18511)
Makefile.mk is redundant with GNUmakefile... 
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2021-01-11    sisyphus    win32/makefile.mk - enable USE_QUADMATH buil
+ds (mingw... 
win32/makefile.mk - enable USE_QUADMATH builds
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win32: remove makefile.mk (#18511)

Makefile.mk is redundant with GNUmakefile. See https://www.nntp.perl.org/group/perl.perl5.porters/2021/01/msg258848.html for more details.

We planned to remove it shortly after the introduction of GNUmakefile but that slipped through the cracks for some reason:

https://github.com/Perl/perl5/issues/14341