Use -pedantic instead of -pedantic-errors.  Fixes #19

-pedantic-errors produces errors for tesseract 3.02.  Simply using
 -pedantic instead turns those into warnings.

Signed-off-by: Rüdiger Sonderfeld <ruediger@c-plusplus.de>
build: No warning for the use of long long.

Signed-off-by: Rüdiger Sonderfeld <ruediger@c-plusplus.de>