- Add a custom triplets for building dynamic android libraries
- Set `ANDROID_NDK_HOME` environment variable, as it is needed when
vcpkg builds for Android.
- Install `perl-IPC-Cmd` when necessary, requirement for OpenSSL.
- Install openSSL for x64-linux-qt, x86-android-qt, and
x86_64-android-qt. The latter android triplet has been renamed from
vcpkg's official `x64-android.cmake` triplet to further clarify the
android abi.
- Adjusted version.txt to account for the existence of two OpenSSL. The
system OpenSSL now shows up as `System's OpenSSL` in `version.txt`.
Task-number: QTBUG-115715
Change-Id: I6cf9b808d26bbea97ebeeadac58cef5ede25ee50
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>