Update jim helper files to use proper configure script support:

Update jim helper files to use proper configure script support:
- configure.in: Add AC_TYPE_LONG_LONG_INT to detect 'long long int' support.
- configure.in: Add AC_C_CONST to provide equivalent support as jim.h.
- jim*.c: include config.h when HAVE_CONFIG_H is defined.
- jim*.{h,c}: use HAVE_LONG_LONG_INT definition from config.h.
- jim.h: Remove hard-coded const and HAVE_LONG_LONG definitions.
- jim.h: -DJIM_NO_CONST has been obsoleted; -Dconst is equivalent.

git-svn-id: svn://svn.berlios.de/openocd/trunk@1744 b42882b7-edfa-0310-969c-e2dbd0fdcd60