[update] prepare for autoconf install

The sys header files would be easier to just get installed next to the
generic header files.  Therefore, urt_sys_*.h are not included with ""
instead of <>.

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
[build] upgrade build system to use autotools

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
[tests] slightly faster tests

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>