tessdata_best and tessdata_fast recently changed the path for script data,
so the tests have to be updated, too.
In addition, the relative paths did not work with out-of-tree builds.
Use absolute paths and add them as C macros to the compiler flags.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
We cannot assume that the locale "en_US.UTF-8" is always available.
Using the "C" locale should work better.
Signed-off-by: Stefan Weil <sw@weilnetz.de>