bail out if macOS 10.9 or lower is used during installer

(cherry picked from commit 48d4a23aa0)
Signed-off-by: Domen Kožar <domen@dev.si>

cc @edolstra

scripts/install-nix-from-closure.sh

@@ -12,6 +12,12 @@ if ! [ -e $self/.reginfo ]; then
     exit 1
 fi
 
+# macOS support for 10.10 or higher
+if [[ "$(uname -s)" = "Darwin" && $(($(sw_vers -productVersion | cut -d '.' -f 2))) -lt 10 ]]; then
+    echo "$0: macOS $(sw_vers -productVersion) is not supported, upgrade to 10.10 or higher"
+    exit 1
+fi
+
 if [ -z "$USER" ]; then
     echo "$0: \$USER is not set" >&2
     exit 1