[sr #110312] 2.69b: broken AC_PROG_LEX macro

Follow-up Comment #8, sr #110312 (project autoconf):

In order to mimic flex's '%option noyywrap', the generated scanner code
(inserted between the first and second %%) needs a declaration (or definition)
of yywrap _before_ the first %%:

Applying

 
diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index e289a018..b352ce24 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -746,6 +746,9 @@ fi])])
 # declares yytext as a char * by default.
 AC_DEFUN([_AC_PROG_LEX_YYTEXT_DECL],
 [cat >conftest.l <<_ACEOF[
+%{
+int yywrap(void);
+%}
 %%
 a { ECHO; }
 b { REJECT; }

to

$ git describe
v2.69c-18-gf1047b2e 

(NB: this excludes the commit 46f384f850, 'Revert to 2.69-compatible behavior
in AC_PROG_LEX') 

makes configure print (for Zack's test configure.ac below)

checking for lex output file root... lex.yy
checking for lex library... none needed
checking whether yytext is a pointer... yes


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