The related code in training/util.h now uses the GOOGLE_TESSERACT macro
to enable Google specific code to disable heap checking.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Modify also the code to use a singleton. This simplifies the code as
no locking is needed. It also slightly improves the performance because
no check whether the architecture was tested is needed.
Signed-off-by: Stefan Weil <sw@weilnetz.de>