android: Remove buildToolsVersion

Finally a default is configured and we don't have to update this
constantly.

diff --git a/src/frontends/android/app/build.gradle b/src/frontends/android/app/build.gradle
index f5b13a8fd68ea0c00dc955e456825ee57d8c39e9..399de1faa5a39083a7b9d64f95c0eb746a653006 100644 (file)
--- a/src/frontends/android/app/build.gradle
+++ b/src/frontends/android/app/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 26
-    buildToolsVersion '27.0.3'
 
     defaultConfig {
         applicationId "org.strongswan.android"