ld: xfail several shared (non PIC) tests on Solaris

Three ld tests currently FAIL on Solaris/SPARC:

FAIL: shared (non PIC)
FAIL: shared (non PIC, load offset)
FAIL: shared (PIC main, non PIC so)

all of them in the same way:

/var/gcc/binutils/sparcv7/obj/binutils/ld/tmpdir/ld/collect-ld: read-only
segment has dynamic relocations

Given that Solaris defaults to -z text, this is to be expected, thus
this patch xfail's them.

Tested on sparc-sun-solaris2.11 and sparcv9-sun-solaris2.11.

	* testsuite/ld-shared/shared.exp: Remove dangling comments.
	xfail shared non PIC tests on Solaris.