ld: testsuite: Mark vers26b3 unsupported on x86_64

After enabling the ld-elfvers tests on Solaris/x86, one of them FAILs on
Solaris/amd64 only:

FAIL: vers26b3

/ld-new: tmpdir/vers26b3.o: relocation R_X86_64_32 against symbol `foo' can not be used when making a shared object; recompile with -fPIC
./ld-new: failed to set dynamic section sizes: bad value

The error is strange: vers26b3.o *was* compiled with -fPIC and repeating
the link with /bin/ld just works.  However, the resulting vers26b3.so
fails to load:

$ ldd -r tmpdir/vers26b3.so
[...]
ld.so.1: vers26b3.so.ld: fatal: relocation error: R_AMD64_32: file tmpdir/vers26b3.so.ld: symbol foo: value 0x7fff34d00830 does not fit

When running the test on Linux/x86_64, it fails with the same ld message
as above, so the test is marked unsupported for both Linux/x86_64 and
Solaris/amd64.

Tested on {amd64,i386}-pc-solaris2.11 and {x86_64,i686}-pc-linux-gnu.

2025-07-31  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	ld:
	* testsuite/ld-elfvers/vers.exp (vers26b3): Mark unsupported on
	Linux/x86_64 and Solaris/amd64.