Whenever we create scripts that are installed to $out, we must use runtimeShell
in order to get the shell that can be executed on the machine we create the
package for. This is relevant for cross-compiling. The only use case for
stdenv.shell are scripts that are executed as part of the build system.
Usages in checkPhase are borderline however to decrease the likelyhood
of people copying the wrong examples, I decided to use runtimeShell as well.
Add shebang line to terminal-notifier to wrapper script. Without this line, the
script fails with "Exec format error" when called outside a shell (e.g. from
the Emacs alert package).
