gwenhywfar: clean up options
aspell: autogenerate options

Generate options from the available_languages list.

Closes #9723.
New formula: at-spi2-core 2.6.3
New formula: at-spi2-atk 2.6.2
gtk+3 3.6.4
libagg: use optional dep
postgres-xc: use optional dep
mcabber 0.10.2
putty: add optional dep on gtk+

Closes #17533.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
qt5: fails with clang again.

Fixes #17535.
autogen 5.17.1
lilypond: remove skip_clean :all
mlton: remove skip_clean :all
visualnetkit: remove skip_clean :all
povray: fix audit
mecab-ipadic: document args