Use toplevel unit_name (nonstd-lite-project 56)

nonstd-lite/nonstd-lite#56

Author: martinmoene

example/CMakeLists.txt

@@ -11,7 +11,7 @@ endif()
 
 project( example LANGUAGES CXX )
 
-set( unit_name "boolean" )
+# unit_name provided by toplevel CMakeLists.txt
 set( PACKAGE   ${unit_name}-lite )
 set( PROGRAM   ${unit_name}-lite )