Replace the Tesseract specific data types in header files which are
part of Debian package libtesseract-dev by POSIX data types.
Update also matching cpp files.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
The code in ccutil/hashfn.h was needed for some old compilers. Now that we support MSVC >= 2010 and compilers that has good support for C++11, we can drop this code.
As a result of this file removal, we now use:
std::unordered_map
std::unordered_set
std::unique_ptr
directly in the codebase with '#include' for the needed headers.