Fix some issues, warnings + improvements.

Dear Maintainer, sorry for bothering you. I hope this MR finds you well. I tested the mc package and found some warnings, typos and small errors, my MR fixes these things.

• Fixed Lintian warnings:

W: redundant-installation-prerequisite
W: patch-file-present-but-not-mentioned-in-series

!8 (93b64f09)

!8 (f26c5ec9)

• Fixed another warnings (during package building):

...
dh_gencontrol
dpkg-gencontrol: warning: Recommends field of package mc: substitution variable ${misc:Recommends} used, but is not defined
dpkg-gencontrol: warning: package mc: substitution variable ${perl:Depends} unused, but is defined
dpkg-gencontrol: warning: Recommends field of package mc: substitution variable ${misc:Recommends} used, but is not defined
dpkg-gencontrol: warning: package mc: substitution variable ${perl:Depends} unused, but is defined
...

!8 (c548d1ce)

• Updated some URLs to HTTPS (without redirects):

!8 (c74f7fb6)

• Added d/upstream/metadata file:

!8 (950a5d71)

Conclusion: I builded and tested the package with my commits, it got better! Also you can read commits description. Thanks