linux/dummy_check.sh: remove obsolete script

Starting with commit v4.10-62-ga0bd374, function prototypes
of syscall parsers are generated at build time.

* linux/dummy_check.sh: Remove.

linux/dummy_check.sh

@@ -1,6 +0,0 @@
-#!/bin/sh
-
-grep '^#define' dummy.h | cut -f2 | \
-while read func; do
-	grep -q -F -- "${func}(" syscall.h && echo "Defined as macro and as func: $func"
-done