Update libspectrum and fuse[utils] to their latest versions.

libspectrum:

• 1.3.5 -> 1.3.6
• add libspectrum.pc

fuse:

• 1.3.7 -> 1.3.8

fuse-utils:

• 1.3.1 -> 1.3.2
• remove obsolete comment in Makefile about removed ffmpeg1 port
• add missing libraries
• sort pkg-plist

Reported by: portscout