Define standard hunspell dict location

[Brian J. Tarricone]

Dominic Lachowicz wrote:

> 2) Install a "hunspell" program in $PATH that returns a path when
> something like "--dictionary-directory" is specified. Aspell does
> something similar.

Or, preferably, a pkg-config file, e.g., 'pkg-config --variable=dictdir 
hunspell'.

	-brian