Libite (-lite) v2.5.0

Note: namespace change; the -lite library include files have moved
from lite/*.h to libite/*.h due to an unfortunate clash
with "LiTE is a Toobox Engine", from the DirectFB project.
For a transitional period, however, a compatibility symlink
is installed; lite -> libite/.

Changes

• Header files have moved from lite/*.h to libite/*.h to prevent
  clashing with DirectFB LiTE library.
• Include guards in header files have been renamed, much in the same
  fashion as the move (above), from LITE_foo_H_ to LIBITE_FOO_H_
• Add configure option to disable compatibility symlink, for systems
  that do not want name clashes with DirectFB/LiTE, or do not need to
  be backwards compatible; use configure --without-symlink

Fixes

• Minor, use defensive coding in strnlen() replacement. Only used
  on systems that do not have a native implementation.