[Perl/perl5] 4cefad: Add the makefile that is generated by Test::Smoke

[Abe Timmerman via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 4cefad06df853bd2c3c2509f5a0521604b06514c
      
https://github.com/Perl/perl5/commit/4cefad06df853bd2c3c2509f5a0521604b06514c
  Author: Abe Timmerman <abel...@cpan.org>
  Date:   2023-10-14 (Sat, 14 Oct 2023)

  Changed paths:
    M .gitignore

  Log Message:
  -----------
  Add the makefile that is generated by Test::Smoke

On MSWin32 Test::Smoke creates a new file (win32/smoke.mk) that should
be ignored by the porting tests.