Add patch step for Lua source code in GitHub workflow

This commit introduces a step to apply a patch to the Lua source code using a provided `lua.pat` file. This lessens the warnings coming from the Open Watcom build process and is a step that happens before proceeding with the 16-bit DOS build.

Author: Lethja

.github/workflows/LuaWatcom.yml

@@ -16,6 +16,10 @@ jobs:
         submodules: recursive
         fetch-depth: 0
 
+    - name: Patch Lua Source Code for Open Watcom
+      run: |
+        patch -p0 -i lua.pat
+
     - name: Build Lua for DOS 16-bit
       run: |
         export INCLUDE=$WATCOM/h