audio/audacity: sort out dependencies

• Linked with libharfbuzz.so:print/harfbuzz if installed - make it

mandatory

• Used libavformat.so:multimedia/ffmpeg instead of libavcodec.so and

load it at runtime, not linked with it

• Sort records in LIB_DEPENDS

PR: 278585
Approved by: xxjack12xx@gmail.com (maintainer)