Update OpenVPN for Android to 0.7.8 (161)

Closes fdroid/fdroiddata#1639.

metadata/de.blinkt.openvpn.txt

@@ -274,6 +274,15 @@ Build:0.7.7,160
     rm=main/src/main/cpp/mbedtls/tests
     ndk=r16b
 
+Build:0.7.8,161
+    commit=v0.7.8
+    subdir=main
+    submodules=yes
+    gradle=normal
+    rm=main/src/main/cpp/mbedtls/tests
+    scandelete=.gradle
+    ndk=r19c
+
 Maintainer Notes:
 Build instructions:
 https://github.com/schwabe/ics-openvpn/blob/master/.travis.yml
@@ -281,5 +290,5 @@ https://github.com/schwabe/ics-openvpn/blob/master/.travis.yml
 
 Auto Update Mode:Version v%v
 Update Check Mode:Tags
-Current Version:0.7.7
-Current Version Code:160
+Current Version:0.7.8
+Current Version Code:161