support for compiling on windows

Summary:

support for compiling on windows using msys64

... (write here)

Steps to reproduce:

try to generate scripts for a ninja build based on the existing cmaske files on windows 10 64bit

• open Inkscape
• ...

What happened?

the make scripts failed to generate correctly

What should have happened?

the make scripts should have generated correctly

Sample attachments: i fixed the cmsker files and can upload

Version Info:

- 1.0: ... <!-- (run inkscape -V or copy from Help → About Inkscape, top right) -->
- windows: ...
- Operating System version: 10 64bit ...