Remove PDF file on clean, have clean.sh invoke "make clean"

doc/Makefile

@@ -105,9 +105,9 @@ ${TXTFILE}: ${FOFILE}
 .PHONY: clean
 clean: 
 	@rm -f *~ *.bak *.orig \#*\# .\#* texput.log
-	@rm -rf html ${PSFILE} ${HTMLFILE} html-stamp
-	@rm -f ${TMPFILES} ${FOFILE}
-	@rm -f  ${DVIFILE} ${TXTFILE}
+	@rm -rf html $(PSFILE) $(HTMLFILE) $(PDFFILE) html-stamp
+	@rm -f $(TMPFILES) $(FOFILE)
+	@rm -f  $(DVIFILE) $(TXTFILE)
 
 .PHONY: distclean
 distclean: clean

doc/clean.sh

@@ -1,10 +1,6 @@
 #!/bin/sh
 
-# Remove directories which are known to be generated for output only.
-rm -rf html/
+. ../find-gnumake.sh
+find_gnumake
 
-# Remove files whose suffixes indicate that they're generated (e.g.
-# HTML or PostScript) not source (DocBook/SGML, build scripts, etc.).
-find . \( \
-	-name '*.htm' -o \
-	-name '*.html' \) -print | xargs rm -f
+$GNUMAKE clean