Currently hundreds of tests FAIL on Solaris with

warning: could not convert '...' from the host encoding (ISO-8859-1) to UTF-32.
This normally should not happen, please file a bug report.

This happens because the system headers don't define __STDC_ISO_10646__
which was only introduced in C17.  However, Solaris libc only conforms
to C11.  Consequently PHONY_ICONV is defined, leading to those failures.

However, Solaris 11.4 iconv is good enough to use: enabling its use
fixes 300+ failures.

The results are on par with those using GNU libiconv 1.17, while
forcibly disabling HAVE_ICONV on Linux/x86_64 adds causes the same
amount of failures.

Tested on sparcv9-sun-solaris2.11, x86_64-pc-solaris2.11, and
x86_64-pc-solaris2.11.

Ok for trunk?

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University