ci: add a `v.c can be compiled and run with -os cross` step on the macos job too

.github/workflows/ci.yml

@@ -319,6 +319,13 @@ jobs:
           ./v cmd/tools/test_if_v_test_system_works.v
           ./cmd/tools/test_if_v_test_system_works
 
+      - name: v.c can be compiled and run with -os cross
+        run: |
+          ./v -os cross -o /tmp/v.c cmd/v
+          cc -g -std=gnu11 -w -o v_from_vc /tmp/v.c  -lm -lpthread
+          ls -lart v_from_vc
+          ./v_from_vc version
+
       - name: Self tests
         run: VJOBS=1 ./v -silent test-self
 
@@ -396,12 +403,12 @@ jobs:
         run: ./v -freestanding run vlib/os/bare/bare_example_linux.v
       - name: v self compilation
         run: ./v -o v2 cmd/v && ./v2 -o v3 cmd/v && ./v3 -o v4 cmd/v
-# QTODO
-#      - name: v self compilation with -usecache
-#        run: |
-#          ./v -o v2 -usecache cmd/v
-#          ./v2 -o v3 -usecache cmd/v
-#          ./v3 -usecache examples/tetris/tetris.v
+      # QTODO
+      #      - name: v self compilation with -usecache
+      #        run: |
+      #          ./v -o v2 -usecache cmd/v
+      #          ./v2 -o v3 -usecache cmd/v
+      #          ./v3 -usecache examples/tetris/tetris.v
       - name: Verify `v test` works
         run: |
           ./v cmd/tools/test_if_v_test_system_works.v
@@ -448,7 +455,7 @@ jobs:
           ls
 
   #        ./1m
-  #run: echo "TODO" #cd examples/native && ../../v -native hello_world.v && ./hello_world
+  # run: echo "TODO" #cd examples/native && ../../v -native hello_world.v && ./hello_world
   #    - name: Coveralls GitHub Action
   #      uses: coverallsapp/github-action@v1.0.1
   #      with:
@@ -487,12 +494,12 @@ jobs:
           ASAN_OPTIONS=detect_leaks=0 UBSAN_OPTIONS=print_stacktrace=1:halt_on_error=1 ./v5 -o v.c cmd/v
       - name: v self compilation
         run: ./v -o v2 cmd/v && ./v2 -o v3 cmd/v && ./v3 -o v4 cmd/v
-# QTODO
-#      - name: v self compilation with -usecache
-#        run: |
-#          ./v -o v2 -usecache cmd/v
-#          ./v2 -o v3 -usecache cmd/v
-#          ./v3 -usecache examples/tetris/tetris.v
+      # QTODO
+      #      - name: v self compilation with -usecache
+      #        run: |
+      #          ./v -o v2 -usecache cmd/v
+      #          ./v2 -o v3 -usecache cmd/v
+      #          ./v3 -usecache examples/tetris/tetris.v
       - name: Verify `v test` works
         run: |
           ./v cmd/tools/test_if_v_test_system_works.v