Update mgwport package

[t-b]

• More robust downloading More robust downloading sschuberth/mgwport#3
• Deterministic build patches More deterministic builds enhancements sschuberth/mgwport#2
• Add port file sschuberth/mgwport@f3d97fc
• Create package

[dscho]

@t-b do we still need that, now that we switch to MSys2 right away?

[t-b]

@dscho Nope!