Remove commented definition of the MKHOWTO macro.

Doc/Makefile

@@ -97,7 +97,6 @@ TEXINPUTS=$(PWD)/commontex:
 # built using the second flavor, where the preferred version is from
 # the Python CVS trunk.
 MKHOWTO=   TEXINPUTS=$(TEXINPUTS) $(PYTHON) $(PWD)/tools/mkhowto
-#MKHOWTO=   TEXINPUTS=$(TEXINPUTS) mkhowto
 
 MKDVI=	   $(MKHOWTO) --paper=$(PAPER) --dvi
 MKHTML=	   $(MKHOWTO) --html --about html/stdabout.dat \