Fix for autoupdating AC_DECL_YYTEXT

[Pavel Roskin]

Hello!

Autoupdate replaces AC_DECL_YYTEXT with AC_REQUIRE([AC_PROG_LEX]), but
AC_REQUIRE is not allowed outside AC_DEFUN.

In fact, nobody wants to use AC_PROG_LEX more than once, so it should be
defined by AC_DEFUN_ONCE. Having done that, it becomes safe to use
AC_PROG_LEX instead of AC_REQUIRE([AC_PROG_LEX]).

ChangeLog:
        * acspecific.m4 (AC_PROG_LEX): Use AC_DIVERT_ONCE.
        (AC_DECL_YYTEXT): Don't use AC_REQUIRE because autoupdate
        would place it into configure.in but it's not allowed
        outside AC_DEFUN.

Regards,
Pavel Roskin

____________________
Index: acspecific.m4
--- acspecific.m4       Thu Sep 28 06:34:53 2000
+++ acspecific.m4       Thu Sep 28 10:58:48 2000
@@ -128,7 +128,7 @@
 # -----------
 # Look for flex or lex.  Set its associated library to LEXLIB.
 # Check if lex declares yytext as a char * by default, not a char[].
-AC_DEFUN([AC_PROG_LEX],
+AC_DEFUN_ONCE([AC_PROG_LEX],
 [AH_CHECK_LIB(fl)dnl
 AH_CHECK_LIB(l)dnl
 AC_CHECK_PROG(LEX, flex, flex, lex)
@@ -187,7 +187,7 @@
 
 # Require AC_PROG_LEX in case some people were just calling this macro.
 AU_DEFUN([AC_DECL_YYTEXT],
-[AC_REQUIRE([AC_PROG_LEX])])
+[AC_PROG_LEX])
 
 
 # AC_PROG_INSTALL
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