Add sparc and sparc64 support

Also get rid of the arch private ffz functions, the generic
one is just fine.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/io_u.c b/io_u.c
index e4e1693..1637b74 100644
--- a/io_u.c
+++ b/io_u.c
@@ -7,6 +7,7 @@
 
 #include "fio.h"
 #include "hash.h"
+#include "lib/ffz.h"
 
 /*
  * Change this define to play with the timeout handling
@@ -108,7 +109,7 @@
 	*b = (i * BLOCKS_PER_MAP);
 	while ((*b) * min_bs < f->real_file_size) {
 		if (f->file_map[i] != -1UL) {
-			*b += fio_ffz(f->file_map[i]);
+			*b += ffz(f->file_map[i]);
 			if (*b > last_block(td, f, ddir))
 				break;
 			f->last_free_lookup = i;