Remove temporary file

tests/Makefile.am

@@ -108,6 +108,7 @@ hamlibdatetime.h: FORCE
 		echo "/* This date time is from the last non-merge commit to Hamlib. */" > $(builddir)/$(@F).tmp ;\
 		echo "#define HAMLIBDATETIME "\"$$(TZ=UTC git --git-dir=$(top_srcdir)/.git log --no-merges --date='format-local:%a %b %d %H:%M:%S %Y %z SHA=' --format='%cd' -n 1)$$(git --git-dir=$(top_srcdir)/.git log --no-merges | grep commit | head -n 1 | cut -c8-13)\"  >> $(builddir)/$(@F).tmp ;\
 		diff -qN $(builddir)/$(@F).tmp $(builddir)/$(@F) ; test $$? -eq 0 || { echo "Generating SCS header \"$(builddir)/$(@F)\"" ; mv -f $(builddir)/$(@F).tmp $(builddir)/$(@F) ; } ;\
+		rm -f $(builddir)/$(@F).tmp ;\
 	else \
 		test -f $(srcdir)/$(@F) || cp $(srcdir)/$(@F).in $(srcdir)/$(@F) ;\
 	fi