gst/nsf/: Update our internal nosefart to nosefart-2.7-mls to fix segfaults on some...

gst/nsf/: Update our internal nosefart to nosefart-2.7-mls to fix segfaults on some files. Fixes bug #498237.

Original commit message from CVS:
Patch by: Andreas Henriksson <andreas at fatal dot set>
* gst/nsf/Makefile.am:
* gst/nsf/dis6502.h:
* gst/nsf/fds_snd.c:
* gst/nsf/fds_snd.h:
* gst/nsf/fmopl.c:
* gst/nsf/fmopl.h:
* gst/nsf/gstnsf.c:
* gst/nsf/log.c:
* gst/nsf/log.h:
* gst/nsf/memguard.c:
* gst/nsf/memguard.h:
* gst/nsf/mmc5_snd.c:
* gst/nsf/mmc5_snd.h:
* gst/nsf/nes6502.c:
* gst/nsf/nes6502.h:
* gst/nsf/nes_apu.c:
* gst/nsf/nes_apu.h:
* gst/nsf/nsf.c:
* gst/nsf/nsf.h:
* gst/nsf/osd.h:
* gst/nsf/types.h:
* gst/nsf/vrc7_snd.c:
* gst/nsf/vrc7_snd.h:
* gst/nsf/vrcvisnd.c:
* gst/nsf/vrcvisnd.h:
Update our internal nosefart to nosefart-2.7-mls to fix segfaults
on some files. Fixes bug #498237.
Remove some // comments, fix some compiler warnings and use pow()
instead of a slow, selfmade implementation.