[crystax] Remove hardcoded sdl2 bootstrap in rebuild_updated_recipes

Since now we have an smartest way to determine the right bootstrap based on recipes, it's time to rely on it for our `rebuild_updated_recipes`

Closes: #1594

Author: opacam

ci/rebuild_updated_recipes.py

@@ -67,7 +67,7 @@ def build(target_python, requirements):
         # iterates to stream the output
         for line in sh.python(
                 testapp, 'apk', '--sdk-dir', android_sdk_home,
-                '--ndk-dir', android_ndk_home, '--bootstrap', 'sdl2', '--requirements',
+                '--ndk-dir', android_ndk_home, '--requirements',
                 requirements, _err_to_out=True, _iter=True):
             print(line)