[Bug-readline] Unexpected autoconf substitution in config.h.in

[Valeriy E. Ushakov]

readline-5.2

config.h.in has near very end the following code:

#if defined (STRCOLL_BROKEN)
#  undef HAVE_STRCOLL
#endif

with an obvious intention to pretend that strcoll is not there if we
know it's broken.  Unfortunately autoconf is too smart and treats that
#undef as requiring substitution, so config.h on a system that has
strcoll ends up with:

#if defined (STRCOLL_BROKEN)
#  define HAVE_STRCOLL 1
#endif

which will do the wrong thing is strcoll is indeed broken.

SY, Uwe
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