ports/100650: audio/moc dumps core when detach/quit

[Xiao-Yong Jin]

I ran a back trace.

(gdb) bt
#0  0x00000000 in ?? ()
#1  0x2862ef0c in __do_global_dtors_aux () from /usr/local/lib/libmpcdec.so.4
#2  0x28636d98 in _fini () from /usr/local/lib/libmpcdec.so.4
#3  0x2808a37e in _rtld_error () from /libexec/ld-elf.so.1
#4  0x2808d3eb in dlclose () from /libexec/ld-elf.so.1
#5  0x0806fafd in lt_dlseterror ()
#6  0x08070bea in lt_dlclose ()
#7  0x08070b09 in lt_dlpreload_default ()
#8  0x08070bf4 in lt_dlclose ()
#9  0x08070d2a in lt_dlexit ()
#10 0x08059388 in decoder_cleanup ()
#11 0x080533b0 in main ()

Although no debugging symbols in the binary, it shows that there's
something wrong with the libmpcdec.  Hope it helps.

-- 
Xiao-Yong