Fails to cross-compile due to FRIBIDI_CHARSET_CAP_RTL test

[benwolsieffer]

Hello,

I attempted to cross-compile mailutils and found that it fails because
the FRIBIDI_CHARSET_CAP_RTL check uses AC_RUN_IFELSE. It seems like
this should be able to use AC_COMPILE_IFELSE instead, since it is just
checking for the existence of a preprocessor define. This would avoid
the cross-compilation problems. I have attached a patch.

Thanks, Ben

0001-configure-don-t-try-to-run-FRIBIDI_CHARSET_CAP_RTL-t.patch
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