Remove stale file ccan/priority_queue/test/run.c

In commit 37825438 "order: Scalar comparison functions", I accidentally
checked in a file which didn't belong with that commit, and was actually
from a module I was experimenting with but wasn't ready to commit.

This cleans up the bogus extra file.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

ccan/priority_queue/test/run.c

-#include <ccan/priority_queue/priority_queue.h>
-#include <ccan/tap/tap.h>
-
-int main(void)
-{
-	/* This is how many tests you plan to run */
-	plan_tests(3);
-
-	/* Simple thing we expect to succeed */
-	ok1(some_test())
-	/* Same, with an explicit description of the test. */
-	ok(some_test(), "%s with no args should return 1", "some_test")
-	/* How to print out messages for debugging. */
-	diag("Address of some_test is %p", &some_test)
-	/* Conditional tests must be explicitly skipped. */
-#if HAVE_SOME_FEATURE
-	ok1(test_some_feature())
-#else
-	skip(1, "Don't have SOME_FEATURE")
-#endif
-
-	/* This exits depending on whether all tests passed */
-	return exit_status();
-}