Port to mingw

[mkoeppe]

In the form of MSYS2 (https://www.msys2.org/)

• on GH actions (https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md#msys2): MSYS2 with Pacman 5.2.2 - Location: C:\msys64 - Note: MSYS2 is pre-installed on image but not added to PATH.

• https://github.com/msys2/setup-msys2

• available packages: https://packages.msys2.org/base

CC: @embray @slel

Component: porting

Keywords: windows, mingw, msys2

Issue created by migration from https://trac.sagemath.org/ticket/31090

[mkoeppe]

Description changed:

--- 
+++ 
@@ -1 +1,7 @@
 
+
+In the form of MSYS2 (https://www.msys2.org/)
+
+- on GH actions (https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md#msys2): MSYS2 with Pacman 5.2.2 - Location: `C:\msys64` - 
+Note: MSYS2 is pre-installed on image but not added to PATH.
+

[mkoeppe]

Description changed:

--- 
+++ 
@@ -2,6 +2,10 @@
 
 In the form of MSYS2 (https://www.msys2.org/)
 
-- on GH actions (https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md#msys2): MSYS2 with Pacman 5.2.2 - Location: `C:\msys64` - 
-Note: MSYS2 is pre-installed on image but not added to PATH.
+- on GH actions (https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md#msys2): MSYS2 with Pacman 5.2.2 - Location: `C:\msys64` - Note: MSYS2 is pre-installed on image but not added to PATH.
 
+- https://github.com/msys2/setup-msys2
+
+- available packages: https://packages.msys2.org/base
+
+

[slel]

Changed keywords from none to windows, mingw, msys2

[mkoeppe]

comment:5

Setting new milestone based on a cursory review of ticket status, priority, and last modification date.