rtai: Install modules in /lib/modules/<version>/rtai

The /lib/modules/<version>/kernel/ is completely rewritten by the
kernel module installation, so third party modules should be outside
of this directory.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/rtai/rtai.mk

@@ -8,7 +8,7 @@ RTAI_CONF_OPT = \
 	--with-linux-dir=$(LINUX_DIR) 	\
 	--disable-leds		      	\
 	--disable-rtailab		\
-	--with-module-dir=/lib/modules/$(LINUX_VERSION_PROBED)/kernel/rtai
+	--with-module-dir=/lib/modules/$(LINUX_VERSION_PROBED)/rtai
 
 RTAI_MAKE = $(MAKE1)