Provisioning: Use SetEnvVar helper function in scripts

Currently when adding an environment variable in provisioning we have
to check if the system is Ubuntu and use .profile instead of .bashrc.
This check should be done in a function so we don't have to duplicate
it for every provisioning script separately.

Change-Id: I2fa128032123e17d20dfb39cd3668e22e4bb0d55
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>

coin/provisioning/common/linux/openssl_for_android_linux.sh

@@ -38,6 +38,7 @@
 
 source "${BASH_SOURCE%/*}/../unix/try_catch.sh"
 source "${BASH_SOURCE%/*}/../unix/DownloadURL.sh"
+source "${BASH_SOURCE%/*}/../unix/SetEnvVar.sh"
 
 version="1.0.2g"
 officialUrl="https://www.openssl.org/source/openssl-$version.tar.gz"
@@ -64,7 +65,8 @@ try
     pushd "$opensslHome"
     perl Configure shared android || throw $ExceptionConfig
 
-    echo "export OPENSSL_ANDROID_HOME=$opensslHome" >> ~/.bashrc
+    SetEnvVar "OPENSSL_ANDROID_HOME" "$opensslHome"
+
     echo "OpenSSL for Android = $version" >> ~/versions.txt
 )
 catch || {