Pregenerate lex and yacc files and remove the build dependency on those

programs.

libpcap/configure.in

@@ -848,24 +848,6 @@ if test "$V_PCAP" = septel -a "$ac_cv_lbl_septel_api" = no; then
 fi
 
 
-AC_LBL_LEX_AND_YACC(V_LEX, V_YACC, pcap_)
-if test "$V_LEX" = lex ; then
-# Some versions of lex can't handle the definitions section of scanner.l .
-# Try lexing it and complain if it can't deal.
-	AC_CACHE_CHECK([for capable lex], tcpdump_cv_capable_lex,
-		if lex -t scanner.l > /dev/null 2>&1; then
-			tcpdump_cv_capable_lex=yes
-		else
-			tcpdump_cv_capable_lex=insufficient
-		fi)
-	if test $tcpdump_cv_capable_lex = insufficient ; then
-		AC_MSG_ERROR([Your operating system's lex is insufficient to compile
- libpcap.  flex is a lex replacement that has many advantages, including
- being able to compile libpcap.  For more information, see
- http://www.gnu.org/software/flex/flex.html .])
-	fi
-fi
-
 #
 # Assume a.out/ELF convention for shared library names (".so"), and
 # V7/BSD convention for man pages (file formats in section 5,
@@ -1004,10 +986,8 @@ AC_SUBST(V_CCOPT)
 AC_SUBST(V_DEFS)
 AC_SUBST(V_INCLS)
 AC_SUBST(V_LIBS)
-AC_SUBST(V_LEX)
 AC_SUBST(V_PCAP)
 AC_SUBST(V_FINDALLDEVS)
-AC_SUBST(V_YACC)
 AC_SUBST(SSRC)
 AC_SUBST(DYEXT)
 AC_SUBST(DAGLIBS)