Fix MSYS2 CI

Author: ddeclerck

.github/workflows/windows-msys2.yml

@@ -47,6 +47,8 @@ jobs:
       - name: Build GnuCOBOL Source Distribution
         shell: msys2 {0}
         run: |
+          # Export added on 2025-02-11 to fix texi2dvi bug
+          export OSTYPE=msys
           make -C _build --jobs=$(($(nproc)+1))
           make -C _build --jobs=$(($(nproc)+1)) dist