dist/tools/coccinelle/force: remove static.cocci

The rule is not behaving as it should and flagging all 'static'
variables based only on initialization (if the variable is initialized
before usage), but fails to recognize if 'static' is used to limit
visibility.

dist/tools/coccinelle/force/static.cocci

@@ -1,25 +0,0 @@
-// remove unused static property of function-local static variable
-// (from Julia Lawall, see https://lists.riot-os.org/pipermail/devel/2017-May/005133.html)
-
-@bad exists@
-position p;
-identifier x;
-type T;
-@@
-
-static T x@p;
-...
-x = <+...x...+>
-
-@@
-identifier x;
-expression e;
-type T;
-position p != bad.p;
-@@
-
--static
- T x@p;
- ... when != x
-     when strict
-?x = e;