We don't need texlive in the core bootstrap cycle

Index: flex-2.5.37/doc/Makefile.am
===================================================================
--- flex-2.5.37.orig/doc/Makefile.am
+++ flex-2.5.37/doc/Makefile.am
@@ -2,7 +2,7 @@ help2man = @HELP2MAN@
 
 info_TEXINFOS =	flex.texi
 dist_man_MANS = flex.1
-dist_doc_DATA= flex.pdf
+#dist_doc_DATA= flex.pdf
 
 CLEANFILES = \
 	flex.hks \
