mq.c: remove repeated code
mq.c: remove repeated code

* mq.c (sys_mq_open): Use printmqattr instead of implementing it again.
[HAVE_MQUEUE_H]: Remove.

Distrotech/strace,cuviper/strace,Distrotech/strace,kapdop/android_external_strace,vrastogi/strace,cuviper/strace,cuviper/strace,kapdop/android_external_strace,Saruta/strace,Distrotech/strace,Distrotech/strace,Saruta/strace,kapdop/android_external_strace,kapdop/android_external_strace,cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace,vrastogi/strace,vrastogi/strace,kapdop/android_external_strace,Distrotech/strace,vrastogi/strace,Saruta/strace,vrastogi/strace