python3: update apk build instuctions

gui/kivy/Readme.txt

@@ -12,3 +12,13 @@ then you need to rebuild the distribution. To do so:
 
   rm -rf .buildozer/android/platform/python-for-android/dist
 
+
+how to build with ssl:
+
+  rm -rf .buildozer/android/platform/build/
+  ./contrib/make_apk
+  pushd /opt/electrum/.buildozer/android/platform/build/build/libs_collections/Electrum/armeabi-v7a
+  cp libssl1.0.2g.so /opt/crystax-ndk-10.3.2/sources/openssl/1.0.2g/libs/armeabi-v7a/libssl.so
+  cp libcrypto1.0.2g.so /opt/crystax-ndk-10.3.2/sources/openssl/1.0.2g/libs/armeabi-v7a/libcrypto.so
+  popd
+  ./contrib/make_apk

gui/kivy/tools/buildozer.spec

@@ -31,7 +31,7 @@ version.filename = %(source.dir)s/contrib/versions.py
 #version = 1.9.8
 
 # (list) Application requirements
-requirements = python3crystax, android, openssl, pycrypto, pil, plyer, kivy==master
+requirements = python3crystax, android, openssl, plyer, kivy==master
 
 # (str) Presplash of the application
 #presplash.filename = %(source.dir)s/gui/kivy/theming/splash.png
@@ -70,7 +70,7 @@ android.permissions = INTERNET, WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE
 android.private_storage = True
 
 # (str) Android NDK directory (if empty, it will be automatically downloaded.)
-#android.ndk_path =
+android.ndk_path = /opt/crystax-ndk-10.3.2
 
 # (str) Android SDK directory (if empty, it will be automatically downloaded.)
 #android.sdk_path =