Add mingw32-7z to the master package list

This is necessary if we want to unpack the packages of the MinGW-w64
project (which are all only provided as .7z archives).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
mingw32-git: Upgrade to v2.1.2

And use the new repository URL.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
mingw32-git: Build and add the subtree documentation

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Update package file

And also include the new dependency mingw32-libpcre.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Merge pull request #21 from t-b/update-mingw32-git

Update mingw32-git package to v2.1.2
Use nproc instead of the home-brewed solution

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>