Autotools: Add ext/readline preprocessor macros help texts #15241
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This adds the missing macros help texts for easier understanding. The AC_DEFINE can be called with only 2 arguments if there is another definition in the code where template (see AH_TEMPLATE Autoconf macro) is read by autoheader (the 2nd AC_DEFINE sets the template for all other definitions with the same name).
This is done like this and taking into consideration also that readline library part of the config.m4 file will be removed in the near future due to license mismatch.