removed os2 support & support for building SDL with watcom.

.github/workflows/watcom.yml

@@ -1,35 +0,0 @@
-name: Build (OpenWatcom)
-
-on: [push, pull_request]
-
-jobs:
-  os2:
-    name: ${{ matrix.platform.name }}
-    runs-on: windows-latest
-
-    strategy:
-      matrix:
-        platform:
-        - { name: Windows, makefile: Makefile.w32 }
-        - { name: OS/2,    makefile: Makefile.os2 }
-
-    steps:
-      - uses: actions/checkout@v3
-      - uses: open-watcom/setup-watcom@v0
-      - name: Build
-        run: |
-          wmake -f ${{ matrix.platform.makefile }} ENABLE_WERROR=1
-      - name: Build tests
-        run: |
-          cd test && wmake -f ${{ matrix.platform.makefile }} ENABLE_WERROR=1
-          cd ..
-      - name: Run tests
-        if: "matrix.platform.makefile == 'Makefile.w32'"
-        run: |
-          cd test && wmake -f ${{ matrix.platform.makefile }} check-quick
-          cd ..
-      - name: distclean
-        run: |
-          wmake -f ${{ matrix.platform.makefile }} distclean
-          cd test && wmake -f ${{ matrix.platform.makefile }} distclean
-          cd ..