Added autom4te.cache (autoconf) folder to .gitignore

Signed-off-by: Haru <haru@dotalux.com>
Updated package name to Hercules in the autoconf script

- Replaced old SVN version string with a git-compatible one
- Fixed configure.in warnings on autoconf 2.68 or newer (wrapped code
  snippets in AC_LANG_SOURCE calls, as recommended by autoconf)
- Re-generated configure script with autoconf 2.69

Signed-off-by: Haru <haru@dotalux.com>