ExternalProject: Add support for USES_TERMINAL_PATCH keyword

This brings the patch step into line with all the others which already
had their own `USES_TERMINAL_<step>` keyword. All steps (including
patch) already have their own `LOG_<step>` keyword too, so the lack of
`USES_TERMINAL_PATCH` was inconsistent.

Modules/FetchContent/CMakeLists.cmake.in

@@ -22,6 +22,7 @@ ExternalProject_Add(${contentName}-populate
                     TEST_COMMAND        ""
                     USES_TERMINAL_DOWNLOAD  YES
                     USES_TERMINAL_UPDATE    YES
+                    USES_TERMINAL_PATCH     YES
 )
 
 @__FETCHCONTENT_COPY_FILE@