Mindustry: enable automatic updates.

This patch enables auto updates for Mindustry using UpdateCheckMode HTTP:
https://github.com/Anuken/Mindustry/issues/654

metadata/io.anuke.mindustry.yml

@@ -38,9 +38,9 @@ Builds:
       - buildversion=89
       - versionType=fdroid
 
-  - versionName: 4-fdroid-92
-    versionCode: 92
-    commit: 1cd43f938fa5843984dc82498a75dffe4def75e3
+  - versionName: 4-fdroid-93
+    versionCode: 93
+    commit: v93
     subdir: android
     gradle:
       - yes
@@ -50,13 +50,11 @@ Builds:
       - echo "modifier=beta" >> ../core/assets/version.properties
       - echo "type=fdroid" >> ../core/assets/version.properties
       - echo "number=4" >> ../core/assets/version.properties
-    scanignore:
-      - core/assets/saves
+      - echo "buildversion=$$VERCODE$$" >> gradle.properties
+      - echo "versionType=fdroid" >> gradle.properties
+      - grep archash ../gradle.properties >> gradle.properties
     scandelete:
       - android/libs
-    gradleprops:
-      - buildversion=92
-      - versionType=fdroid
 
 MaintainerNotes: |-
     libgdx.so and libgdx-freetype.so binaries are extracted from
@@ -64,9 +62,8 @@ MaintainerNotes: |-
 
     The folder "assets/saves" contains savegames not executables.
 
-    Cannot use AUM/UCM because version code and version name are dynamic.
-
-AutoUpdateMode: None
-UpdateCheckMode: None
-CurrentVersion: 4-fdroid-92
-CurrentVersionCode: 92
+AutoUpdateMode: Version v%c
+UpdateCheckMode: HTTP
+UpdateCheckData: https://raw.githubusercontent.com/Anuken/MindustryBuilds/master/version_fdroid.txt|versionCode=(.*)|.|versionName=(.*)
+CurrentVersion: 4-fdroid-93
+CurrentVersionCode: 93