linux-user/strace: Improve recvmsg() output

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-By: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180628034652.24152-7-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/strace.list

@@ -1107,7 +1107,7 @@
 { TARGET_NR_recvmmsg, "recvmmsg" , NULL, NULL, NULL },
 #endif
 #ifdef TARGET_NR_recvmsg
-{ TARGET_NR_recvmsg, "recvmsg" , NULL, NULL, NULL },
+{ TARGET_NR_recvmsg, "recvmsg" , "%s(%d,%p,%#x)", NULL, NULL },
 #endif
 #ifdef TARGET_NR_remap_file_pages
 { TARGET_NR_remap_file_pages, "remap_file_pages" , NULL, NULL, NULL },