Add configure script

Get rid of all the fragile guessing and checking of features,
and roll a configure script instead.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/backend.c b/backend.c
index 099bd9b..8e96fb0 100644
--- a/backend.c
+++ b/backend.c
@@ -1074,7 +1074,7 @@
 		goto err;
 	}
 
-#ifdef FIO_HAVE_LIBNUMA
+#ifdef CONFIG_LIBNUMA
 	/* numa node setup */
 	if (td->o.numa_cpumask_set || td->o.numa_memmask_set) {
 		int ret;