fix build gui/icons

Author: rkanavath

gui/icons/CMakeLists.txt

@@ -22,9 +22,12 @@ foreach(ICON ${GRASS_ICONS})
   get_filename_component(FILE_NAME ${ICON} NAME)
   add_custom_command(
     OUTPUT ${GISBASE}/gui/icons/grass/${FILE_NAME}
-    COMMAND ${CMAKE_COMMAND} -E copy ${ICON} ${GISBASE}/gui/icons/grass/
-    COMMAND ${CMAKE_COMMAND} -E copy ${ICON} ${GISBASE}/docs/html/icons/)
+    COMMAND ${CMAKE_COMMAND} -E copy ${ICON} ${GISBASE}/gui/icons/grass/)
   list(APPEND output_icons ${GISBASE}/gui/icons/grass/${FILE_NAME})
+
+  add_custom_command(
+    OUTPUT ${GISBASE}/docs/html/icons/${FILE_NAME}
+    COMMAND ${CMAKE_COMMAND} -E copy ${ICON} ${GISBASE}/docs/html/icons/)
   list(APPEND output_icons ${GISBASE}/docs/html/icons/${FILE_NAME})
 endforeach()