configure.in: Remove AC_PROG_LEX and AC_PROG_YACC.

configure.in: Remove AC_PROG_LEX and AC_PROG_YACC.

	* configure.in: Remove AC_PROG_LEX and AC_PROG_YACC.  Look for
	flex and bison, specifically, first in a unified build and
	then installed on the system.
	* Makefile.in: Set BISON to @BISON@, FLEX to @FLEX@.  Rename
	LEXFLAGS to FLEXFLAGS.  Adjust ORDINARY_FLAGS_TO_PASS to
	match.

	(collect2.o, gcc.o, prefix.o, toplev.o, alloca.o, intl.o,
	cppdefault.o): Remove pointless sed munging of source file
	name.

f:
	* Make-lang.in (f/fini.o, f/proj-h.o): Remove pointless sed
	munging of source file name.
	($(srcdir)/f/intdoc.texi): Break up into several rules each of
	which builds just one thing.  Don't mess with $(LANGUAGES).
	(f/ansify.o, f/intdoc.o): Remove unnecessary rules.

From-SVN: r37371