armbian-next: add core extension c-plus-plus-compiler which hostdeps on g++-aarch64-linux-gnu and enable it in JetHub family

extensions/c-plus-plus-compiler.sh

@@ -0,0 +1,7 @@
+# The C++ compiler is no longer included by default in prepare-host.sh.
+# Enable this extension if you need a C++ compiler during the build.
+
+function add_host_dependencies__add_arm64_c_plus_plus_compiler() {
+	display_alert "Adding arm64 c++ compiler to host dependencies" "g++" "debug"
+	export EXTRA_BUILD_DEPS="${EXTRA_BUILD_DEPS} g++-aarch64-linux-gnu" # @TODO: convert to array later
+}