[PATCH] Make sure that config.h defines HAVE_LOCALE_H

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Hello,

I ran into an issue building GNU indent from master. The configure
script correctly detects setlocale () but does not check for locale.h.
This means that the actual program doesn't include the header. Usually
the missing symbol is fine but LC_ALL being undefined stops it from
building. I've attached a simple patch just to check for locale.h to
make sure that it is defined.

Thanks,
Collin
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