rigsc docs: easier build, rm note about broken test

rigsc.446/README.md

@@ -17,9 +17,5 @@ See the `doc/` folder for more information on RIGAL in general
 
 ```bash
 cd ${RIGAL}/rigsc.446/src
-export rig="$PWD/../bin"
-export C_INCLUDE_PATH="/usr/include/malloc/"  # for Mac OS X
 make
 ```
-
-**NOTE**: currently there are errors when testing `rigcrf` but most things appear to work anyhow