jni: fix everything but java build
diff --git a/sflphone-android/project.properties b/sflphone-android/project.properties
index a3ee5ab..4ab1256 100644
--- a/sflphone-android/project.properties
+++ b/sflphone-android/project.properties
@@ -11,4 +11,4 @@
 #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
 
 # Project target.
-target=android-17
+target=android-19