Don't build Xorg components that are commented out

gen-special.sh uses the list of files and md5 from the
cat instructions to generate an xml page for each of
the individual components. Until now, there were no commented
out component, so gen-special.sh was not prepared to handle
comments. Now, it removes lines containing comments.

BLFS/gen-special.sh

@@ -116,7 +116,7 @@ EOF
 # So we have to read that command too, since it may be assumed
 # that the preceding package is a dependency of the following,
 # except the first.
-  list_cat="$(sed -n '/>cat/,/EOF</p' $file | grep -v 'cat\|EOF' |
+  list_cat="$(sed -n '/>cat/,/EOF</p' $file | grep -v 'cat\|EOF\|#' |
               awk '{ print $NF }' | sed 's/-&.*//')"
 
 # Rationale for the sed below: the following for breaks words at spaces (unless