Skip xcode_redirect.hpp when checking for identifier.

Makefile

@@ -96,7 +96,7 @@ static:
 #                   include the project identifier; skip subdirectories;
 #                   also removes old submit tarballs, they are outdated
 identifier:
-	@if [ $$(grep --include=*.{h,hpp,c,cpp} --directories=skip -L $(IDENTIFIER) * | wc -l) -ne 0 ]; then echo -n "Missing project identifier in file(s): ";echo `grep --include=*.{h,hpp,c,cpp} --directories=skip -L $(IDENTIFIER) *`;rm -f $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE); exit 1; fi
+	@if [ $$(grep --include=*.{h,hpp,c,cpp} --exclude=xcode_redirect.hpp --directories=skip -L $(IDENTIFIER) * | wc -l) -ne 0 ]; then echo -n "Missing project identifier in file(s): ";echo `grep --include=*.{h,hpp,c,cpp} --directories=skip -L $(IDENTIFIER) *`;rm -f $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE); exit 1; fi
 
 # Build both release and debug executables
 all: clean