linux-user: Improve formatting for mremap()

Improve slightly the strace output for mremap().
Print the old_address and new_address as hex values, old_size and
new_size as unsigned, and the flags as integer.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

linux-user/strace.list

@@ -641,7 +641,7 @@
 { TARGET_NR_mq_unlink, "mq_unlink" , NULL, print_mq_unlink, NULL },
 #endif
 #ifdef TARGET_NR_mremap
-{ TARGET_NR_mremap, "mremap" , NULL, NULL, NULL },
+{ TARGET_NR_mremap, "mremap" , "%s(%#x,%u,%u,%d,%#x)", NULL, NULL },
 #endif
 #ifdef TARGET_NR_msgctl
 { TARGET_NR_msgctl, "msgctl" , NULL, NULL, NULL },