pip: disable PiP on Android < 26

Fixes: https://github.com/jitsi/jitsi-meet/issues/6008

react/features/mobile/picture-in-picture/components/PictureInPictureButton.js

 // @flow
 
+import { Platform } from 'react-native';
+
 import { PIP_ENABLED, getFeatureFlag } from '../../../base/flags';
 import { translate } from '../../../base/i18n';
 import { IconMenuDown } from '../../../base/icons';
  * }}
  */
 function _mapStateToProps(state): Object {
+    const flag = Boolean(getFeatureFlag(state, PIP_ENABLED));
+    let enabled = flag;
+
+    // Override flag for Android < 26, PiP was introduced in Oreo.
+    // https://developer.android.com/guide/topics/ui/picture-in-picture
+    if (Platform.OS === 'android' && Platform.Version < 26) {
+        enabled = false;
+    }
+
     return {
-        _enabled: Boolean(getFeatureFlag(state, PIP_ENABLED))
+        _enabled: enabled
     };
 }