STYLE: use EXECUTE_PROCESS() instead of EXEC_PROGRAM()

Alex

Modules/FindKDE4.cmake

@@ -27,7 +27,7 @@ ENDIF (NOT KDE4_KDECONFIG_EXECUTABLE)
 
 IF (KDE4_KDECONFIG_EXECUTABLE)
    # then ask kde4-config for the kde data dirs
-   EXEC_PROGRAM(${KDE4_KDECONFIG_EXECUTABLE} ARGS --path data OUTPUT_VARIABLE _data_DIR )
+   EXECUTE_PROCESS(COMMAND "${KDE4_KDECONFIG_EXECUTABLE}" --path data OUTPUT_VARIABLE _data_DIR ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
 
    FILE(TO_CMAKE_PATH "${_data_DIR}" _data_DIR)