Remove unneeded include statements for host.h, add required ones and
update the comments for the remaining include statements.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
On most systems float is the IEEE 754 single-precision binary
floating-point format (32 bits). Tesseract does not support other systems.
Signed-off-by: Stefan Weil <sw@weilnetz.de>