mingw32: remove unused dll

[ldennington]

b980ccf added libmpc-3.dll to mingw32/bin, but this dependency is never used. Removing accordingly.

[rimrul]

I'm not sure that is a good idea. We'll probably need to update to rebuild the packages depending on libmpc instead. See msys2/MINGW-packages@5adf565

Edit: looks like gcc is the only package we care about that depends on libmpc.

That should be updated since f0c95e9.

How (and on which commit) did you check it was unused? And why did that check only turn up the 32bit version?

[rimrul]

How (and on which commit) did you check it was unused? And why did that check only turn up the 32bit version?

I think I puzzled it together. You probably missed the failed 64bit check run on
git-for-windows/build-extra#462

I reran the failed jobs, they're not complaining anymore. libpmc is not unused anymore.

[ldennington]

I reran the failed jobs, they're not complaining anymore. libpmc is not unused anymore.

Ok, great. I'll go ahead and close this then.