Replaces execute_process calls to touch files with file(TOUCH) calls

Modules/ExternalData.cmake

@@ -1133,7 +1133,7 @@ if("${ExternalData_ACTION}" STREQUAL "fetch")
 
   if(file_up_to_date)
     # Touch the file to convince the build system it is up to date.
-    execute_process(COMMAND "${CMAKE_COMMAND}" -E touch "${file}")
+    file(TOUCH "${file}")
   else()
     _ExternalData_link_or_copy("${obj}" "${file}")
   endif()

Tests/QtAutogen/RerunRccDepends/CMakeLists.txt

@@ -45,8 +45,7 @@ file(TIMESTAMP "${rccDepBinGen}" rdGenBefore "${timeformat}")
 # - Change a resource files listed in the .qrc file
 # - Rebuild
 execute_process(COMMAND "${CMAKE_COMMAND}" -E sleep 1)
-execute_process(COMMAND "${CMAKE_COMMAND}" -E touch "${rccDepBD}/resPlain/input.txt")
-execute_process(COMMAND "${CMAKE_COMMAND}" -E touch "${rccDepBD}/resGen/input.txt")
+file(TOUCH "${rccDepBD}/resPlain/input.txt" "${rccDepBD}/resGen/input.txt")
 execute_process(COMMAND "${CMAKE_COMMAND}" --build . WORKING_DIRECTORY "${rccDepBD}" RESULT_VARIABLE result)
 if (result)
   message(SEND_ERROR "Second build of rccDepends failed.")
@@ -97,8 +96,7 @@ file(TIMESTAMP "${rccDepBinGen}" rdGenBefore "${timeformat}")
 # - Change a newly added resource files listed in the .qrc file
 # - Rebuild
 execute_process(COMMAND "${CMAKE_COMMAND}" -E sleep 1)
-execute_process(COMMAND "${CMAKE_COMMAND}" -E touch "${rccDepBD}/resPlain/inputAdded.txt")
-execute_process(COMMAND "${CMAKE_COMMAND}" -E touch "${rccDepBD}/resGen/inputAdded.txt")
+file(TOUCH "${rccDepBD}/resPlain/inputAdded.txt" "${rccDepBD}/resGen/inputAdded.txt")
 execute_process(COMMAND "${CMAKE_COMMAND}" --build . WORKING_DIRECTORY "${rccDepBD}" RESULT_VARIABLE result)
 if (result)
   message(SEND_ERROR "Fourth build of rccDepends failed.")

Tests/RunCMake/VS10Project/VsCSharpCustomTags.cmake

@@ -16,8 +16,7 @@ set(fileNames)
 foreach(e ${fileExtensions})
   set(currentFile "${CMAKE_CURRENT_BINARY_DIR}/foo.${e}")
   list(APPEND fileNames ${currentFile})
-  execute_process(COMMAND ${CMAKE_COMMAND} -E touch
-    "${currentFile}")
+  file(TOUCH "${currentFile}")
   string(TOUPPER ${e} eUC)
   set_source_files_properties("${currentFile}"
     PROPERTIES