Scripts for cross-build libmypaint for Windows (MinGW) under Debian 8 Jessie and Debian 9 Stretch

1. install mingw toolchain (via apt-get for ex)

2. run ./build-all.sh

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files:

  build-all.sh    - script to do all things
  
  build.sh        - build selected library (for ex: ./build.sh 64 json-c)
  
  download-all.sh - download and unpack all sources
  
  mingw-vars.sh   - configuration of MinGW toolchain, configured for Debian 8
  