Correct path to version.cpp

This used to refer to a target; now refers to the generated file.

Author: smowton

src/util/CMakeLists.txt

@@ -40,7 +40,7 @@ add_custom_target(
 
 add_library(util
   ${sources}
-  version.cpp)
+  ${CMAKE_CURRENT_BINARY_DIR}/version.cpp)
 
 add_dependencies(util generate_version_cpp)