[sr #110312] 2.69b: broken AC_PROG_LEX macro

Follow-up Comment #10, sr #110312 (project autoconf):

@Zack: I cannot reproduce the issue either. For both autoconf 2.69 and 2.69b
the tiny configure.ac below yields (wih flex 2.6.4): 

checking for flex... flex
checking for lex output file root... lex.yy
checking for lex library... -lfl
checking whether yytext is a pointer... yes


For autoconf 2.69d:

checking for flex... flex
checking for lex output file root... lex.yy
checking for lex library... none needed
checking for library containing yywrap... -lfl
checking whether yytext is a pointer... yes

Anything I can do? I guess it would be best to get the config.logs from
Tomasz's runs for autoconf 2.69 and 2.69b to see what was happening. 

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