ass_parse: remove 2 unused variables

Fallout from the previous commits.
configure.ac: Treat DragonFly as the rest of BSDs
Fix integer overflow in FT_Outline
Merge pull request #116 from hadvaid/dragonfly

configure.ac: Treat DragonFly as the rest of BSDs
Merge pull request #119 from MrSmile/fix-drawing-overflow

Fix integer overflow in FT_Outline
Fix \fade(7-argument version) parse
Don't forget to apply \be to the first/last row/column (again)

The implementation of \be was changed to xy-VSFilter's, which (like
VSFilter's) reads but does not write out the first/last row/column.
Add enough padding for \be to avoid clipping
Use just the necessary amount of padding for any \be value
Calculate \be using [0..64] value range (like VSFilter)

With this, our \be finally closely matches VSFilter's.

The only visible difference is clipping: we add proper padding
and output the whole blurred image, while VSFilter does not add
any padding and hence clips the blurred image too early.
Apply \be after \blur (like VSFilter)
Do the last \be pass using full [0..255] value range
[WIP] Fractional and scaled \be through Dirac deltas and a final box blur