cmd/v: rewrite flags

.github/workflows/alpine.build.sh

@@ -8,7 +8,7 @@ uname -a
 
 make -j4
 
-./v --version
+./v -version
 
 du -s .
 

.github/workflows/ci.yml

@@ -131,7 +131,7 @@ jobs:
         ../../vprod gen1m.v
         ./gen1m > 1m.v
         echo "Building it..."
-        ../../vprod -x64 -o 1m 1m.v
+        ../../vprod -backend x64 -o 1m 1m.v
         echo "Running it..."
         ls
 #        ./1m
@@ -144,7 +144,7 @@ jobs:
     - name: Install dependencies
       run: sudo rm -f /etc/apt/sources.list.d/dotnetdev.list /etc/apt/sources.list.d/microsoft-prod.list; sudo apt-get update; sudo apt-get install --quiet -y postgresql libpq-dev libglfw3 libglfw3-dev libfreetype6-dev libssl-dev sqlite3 libsqlite3-dev libsdl2-dev libsdl2-ttf-dev libsdl2-mixer-dev libsdl2-image-dev
     - name: Download V
-      run: wget https://github.com/vlang/v/releases/latest/download/v_linux.zip && unzip v_linux.zip && ./v --version
+      run: wget https://github.com/vlang/v/releases/latest/download/v_linux.zip && unzip v_linux.zip && ./v -version
     - name: Test V
       run: ./v examples/hello_world.v && examples/hello_world #&& ./v -silent build-examples
 
@@ -157,7 +157,7 @@ jobs:
         brew install freetype glfw openssl sdl2 sdl2_ttf sdl2_mixer sdl2_image
         export LIBRARY_PATH="$LIBRARY_PATH:/usr/local/opt/openssl/lib/"
     - name: Download V
-      run: wget https://github.com/vlang/v/releases/latest/download/v_macos.zip && unzip v_macos.zip && ./v --version
+      run: wget https://github.com/vlang/v/releases/latest/download/v_macos.zip && unzip v_macos.zip && ./v -version
     - name: Test V
       run: ./v examples/hello_world.v && examples/hello_world #&& ./v -silent build-examples
 
@@ -171,7 +171,7 @@ jobs:
         curl -L https://github.com/vlang/v/releases/latest/download/v_windows.zip -o v_windows.zip
         echo Unzipping...
         unzip v_windows.zip
-        v.exe --version
+        v.exe -version
         echo Done
         dir
     - name: Test V