package/gobject-introspection/g-ir-scanner-lddwrapper.in: Fix shellcheck warnings, switch to sh

Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/gobject-introspection/g-ir-scanner-lddwrapper.in

@@ -1,3 +1,3 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
-${HOST_DIR}/sbin/prelink-rtld --root=$(dirname $0)/../../ "$@"
+"${HOST_DIR}"/sbin/prelink-rtld --root="$(dirname "$0")/../../" "$@"