ffmpeg2theora: head fix

The HEAD has moved (… About 2 years ago). Other changes to reflect the
new HEAD, style tweaks, and an exceptionally simple test added.
ffmpeg2theora: update 0.29_1 bottle.

Closes #33418.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
jsoncpp 0.6.0-rc2 (new formula)
jsoncpp: add 0.6.0-rc2 bottle.

Closes #32916.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
asciidoc: update 8.6.9 bottle.
atk: update 2.14.0 bottle.
bdw-gc: update 7.4.2 bottle.
berkeley-db: update 5.3.28 bottle.
coreutils: update 8.23_1 bottle.
docbook: update 5.0 bottle.
doxygen: update 1.8.8 bottle.
erlang: update 17.3 bottle.
fftw: update 3.3.4 bottle.
flac: update 1.3.0 bottle.
gawk: update 4.1.1 bottle.
gdal: update 1.11.1_1 bottle.
ghostscript: update 9.15 bottle.
gnu-getopt: update 1.1.5 bottle.
gtk+3: update 3.14.1 bottle.
gtkmm: update 2.24.4 bottle.