editors/texmaker: fix Hunspell ABI mismatch

The port passes -I. -I/usr/local/include/hunspell ... -I/usr/local/include
but then proceeds to #include "hunspell/hunspell.hxx" which ends up picking
bundled version. #include "hunspell.hxx" would be more correct but would
require adjusting texmaker.pro to add -I./hunspell for OS X.

PR: 214848
Submitted by: rakuco
MFH: 2016Q4