[CI] Add jobs for 32-bit and 64-bit MinGW

[asfimport]

Reporter: Kouhei Sutou / @kou
Assignee: Kouhei Sutou / @kou

Related issues:

• [GLib] Build GLib using Meson in Appveyor (duplicates)
• [C++] Fix build for 32-bit MSYS2 (is related to)

PRs and other links:

• GitHub Pull Request #3471

_{Note: This issue was originally created as ARROW-4353. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Split from https://issues.apache.org/jira/browse/ARROW-4297

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 3471
#3471