CursesDialog: modernize CMake usage

Source/CMakeLists.txt

@@ -1142,7 +1142,7 @@ target_link_libraries(cpack CPackLib)
 
 # Curses GUI
 if(BUILD_CursesDialog)
-  include(${CMake_SOURCE_DIR}/Source/CursesDialog/CMakeLists.txt)
+  add_subdirectory(CursesDialog)
 endif()
 
 # Qt GUI

Source/CursesDialog/CMakeLists.txt

@@ -1,26 +1,22 @@
 # Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
 # file Copyright.txt or https://cmake.org/licensing for details.
 
-set( CURSES_SRCS
-              CursesDialog/cmCursesOptionsWidget.cxx
-              CursesDialog/cmCursesBoolWidget.cxx
-              CursesDialog/cmCursesCacheEntryComposite.cxx
-              CursesDialog/cmCursesDummyWidget.cxx
-              CursesDialog/cmCursesFilePathWidget.cxx
-              CursesDialog/cmCursesForm.cxx
-              CursesDialog/cmCursesLabelWidget.cxx
-              CursesDialog/cmCursesLongMessageForm.cxx
-              CursesDialog/cmCursesMainForm.cxx
-              CursesDialog/cmCursesPathWidget.cxx
-              CursesDialog/cmCursesStringWidget.cxx
-              CursesDialog/cmCursesWidget.cxx
-              CursesDialog/ccmake.cxx
-   )
-
-include_directories(${CURSES_INCLUDE_PATH})
-
-
-add_executable(ccmake ${CURSES_SRCS} )
+add_executable(ccmake
+  ccmake.cxx
+  cmCursesBoolWidget.cxx
+  cmCursesCacheEntryComposite.cxx
+  cmCursesDummyWidget.cxx
+  cmCursesFilePathWidget.cxx
+  cmCursesForm.cxx
+  cmCursesLabelWidget.cxx
+  cmCursesLongMessageForm.cxx
+  cmCursesMainForm.cxx
+  cmCursesOptionsWidget.cxx
+  cmCursesPathWidget.cxx
+  cmCursesStringWidget.cxx
+  cmCursesWidget.cxx
+  )
+target_include_directories(ccmake PRIVATE ${CURSES_INCLUDE_PATH})
 target_link_libraries(ccmake CMakeLib)
 if(CMAKE_USE_SYSTEM_FORM)
   find_path(CURSES_FORM_INCLUDE_DIR NAMES form.h HINTS ${CURSES_INCLUDE_PATH} ${CURSES_INCLUDE_PATH}/ncurses)