Enable full git tree for Android builds

Helps git describe to work properly.

Author: Semphriss

.github/workflows/android.yml

@@ -39,7 +39,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
         with:
-          fetch-depth: 1
+          fetch-depth: 0
           submodules: true
 
       - name: Clone SDL Android repo