Revert "Bump android build tool version."

android10 · android10 · commit 63eb6ed7710c · 2015-06-21T12:36:12.000+02:00
This reverts commit d26d47f.
diff --git a/buildsystem/dependencies.gradle b/buildsystem/dependencies.gradle
@@ -6,7 +6,7 @@ allprojects {
 
 ext {
   //Android
-  androidBuildToolsVersion = '22.0.1'
+  androidBuildToolsVersion = "21.1.2"
   androidMinSdkVersion = 15
   androidTargetSdkVersion = 21
   androidCompileSdkVersion = 21
