remove unecessary patch var

Author: Antoine Hoarau

rtt_rosclock/config/FindXenomai.cmake

@@ -157,7 +157,6 @@ if(XENOMAI_XENO_CONFIG)
     string(REPLACE "-" ";" XENOMAI_VERSION_LIST "${XENOMAI_VERSION_LIST}") # Handle 3.1-dev (git)
     list(GET XENOMAI_VERSION_LIST 0 XENOMAI_VERSION_MAJOR)
     list(GET XENOMAI_VERSION_LIST 1 XENOMAI_VERSION_MINOR)
-    list(GET XENOMAI_VERSION_LIST 2 XENOMAI_VERSION_PATCH)
 
     # Xenomai 2.x native skin (rt_)
     if(${XENOMAI_VERSION_MAJOR} EQUAL 2)