static-destruct: Move static_destruct() logic to implementation file

This will allow us to remove the memory-util.h include from
static-destruct.h as part of #37344.

src/basic/static-destruct.c

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "static-destruct.h"
+
+void static_destruct_impl(const StaticDestructor *start, const StaticDestructor *end) {
+        if (!start)
+                return;
+
+        for (const StaticDestructor *d = ALIGN_PTR(start); d < end; d = ALIGN_PTR(d + 1))
+                switch (d->type) {
+                case STATIC_DESTRUCTOR_SIMPLE:
+                        d->simple.destroy(d->simple.data);
+                        break;
+
+                case STATIC_DESTRUCTOR_ARRAY:
+                        array_cleanup(&d->array);
+                        break;
+
+                default:
+                        assert_not_reached();
+                }
+}