maint: Update check for undocumented functions in Octave manual.

* mk_undocumented_list: Add new exceptions for "bytecode", "desktop".
Change exceptions "lower", "upper" to "tolower", "toupper.

* doc/interpreter/module.mk (undocumented_list): Rewrite makefile rule for
undocumented_list to output clean text as to whether check passed or failed.

doc/interpreter/doccheck/mk_undocumented_list

@@ -115,6 +115,9 @@ exit(1);
 ################################################################################
 # Exception list of functions not requiring a DOCSTRING
 ################################################################################
+# desktop : Remove when terminal widget is no longer experimental
+# bytecode : Remove when VM is no longer experimental
+################################################################################
 __DATA__
 angle
 bessel
@@ -123,9 +126,11 @@ besseli
 besselk
 bessely
 bug_report
+bytecode
 chdir
 dbnext
 debug
+desktop
 end
 exit
 F_DUPFD
@@ -150,7 +155,6 @@ isfinite
 J
 j
 java2mat
-lower
 lstat
 metaclass
 nan
@@ -170,7 +174,8 @@ rticks
 setenv
 slash
 thetaticks
-upper
+tolower
+toupper
 ylabel
 ylim
 ytickangle

doc/interpreter/module.mk

@@ -475,6 +475,16 @@ octetc_DATA += \
 	rm -f $@-t $@
 	-cd $(srcdir)/%reldir%; $(PERL) ./doccheck/mk_undocumented_list > $(@F)-t
 	mv $@-t $@
+	[ -s $@ ] || rm -f $@
+	@cd $(srcdir)/%reldir% ; \
+	if ls undocumented_list >/dev/null 2>&1 ; then \
+		echo "Undocumented function check failed"; \
+		echo "Review doc/interpreter/undocumented_list"; \
+		exit 1 ; \
+	else \
+		echo "Undocumented function check passed"; \
+	fi
+
 .PHONY: %reldir%/undocumented_list
 
 SPELLCHECK_FILES = $(MUNGED_TEXI_SRC:.texi=.scheck)