Temporarily insert "git checkout" to bring in test XML file

refresh.awk

@@ -577,6 +577,7 @@ BEGIN {
       # The only way to tell cppcheck to suppress unusedFunction warnings by symbol name (rather than
       # globally, by file, or file and line number) is to pass it an XML file. We generate suitable XML
       # during "make standalone" above, with a standardised filename, so if it exists, use it.
+      print "    - git checkout -f objs" >> out
       print "    - CMHG_XML=$(test -f objs/cmhg-cppcheck-suppress.xml && echo --suppress-xml=objs/cmhg-cppcheck-suppress.xml || true)" >> out
       # Enable all warnings except those marked inline, plus shiftNegativeLHS (used in _swix macros and
       # therefore ubiquitous) and purgedConfiguration (we don't care if a build switch has no effect).