Replace STATIC_INLINE with static, remove INLINE.

Also removed SUPPRESS_COMPILER_INLINES which is useless.
Include <sys/rusage.h>.
Remove the defunct nmake makefile.

Building on windows will be supported later.
Remove useless detection of CONST and INLINE.
Remove defunct support for hpux and OLD_ULTRIX.
Remove old portability crafts.

This is to prepare to change to standard confiugre script.
Add more missing "const"
Remove USE_STRUCT_DIRENT, always use dirent now.
Skip zero lengh file for asytle.
Switch to autoconf step 1: Checking header.