GitLab

 configure.ac: Accept "*-mingw*", not just "*-mingw32", as
 canonical name of a MinGW build, because using MSYS2 'uname'
 produces "MINGW64".

 src/Makefile.in (emacs$(EXEEXT)): Retry deletion of bootstrap-emacs
 if the initial "rm -f" fails.  This is for MinGW builds, where
 MS-Windows will not allow deleting the executable file of a
 running program.