Add build variables file

This adds a file that contains the variables used in
the android-build-wrapper and build scripts.
This gives a single location for setting which versions
of Qt, NDK and SDK we use when building the mobile app on linux.

Signed-off-by: Joakim Bygdell <j.bygdell@gmail.com>

packaging/android/variables.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+QT_VERSION=5.10
+LATEST_QT=5.10.1
+NDK_VERSION=r14b
+SDK_VERSION=3859397
+ANDROID_BUILDTOOLS_REVISION=25.0.3
+ANDROID_PLATFORMS=android-27
+ANDROID_NDK=android-ndk-${NDK_VERSION}
+ANDROID_SDK=android-sdk-linux
+OPENSSL_VERSION=1.0.2l