Remove configure_file for non-existing documentation config file

Signed-off-by: Julius Härtl <jus@bitgrid.net>

doc/CMakeLists.txt

@@ -16,8 +16,6 @@ if(SPHINX_FOUND)
     install(DIRECTORY ${SPHINX_PDF_DIR} DESTINATION ${APPLICATION_DOC_DIR} OPTIONAL)
     install(DIRECTORY ${SPHINX_QCH_DIR} DESTINATION ${APPLICATION_DOC_DIR} OPTIONAL)
 
-    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/conf.py.in" conf.py @ONLY)
-
     if(WITH_DOC)
        add_custom_target(doc ALL DEPENDS doc-html COMMENT "Building documentation...")
     else(WITH_DOC)