Added missing endif to kernel's Makefile

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

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
Compile fixes of RTAI user-space

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