[testsuite] [sparc] skip tls tests if emulated

A number of tls tests expect TLS-specific relocations, that are not
present when tls is emulated, as on e.g. leon3-elf.  Skip the tests
when tls is emulated.


for  gcc/testsuite/ChangeLog

	* gcc.target/sparc/tls-ld-int16.c: Skip when tls is emulated.
	* gcc.target/sparc/tls-ld-int32.c: Likewise.
	* gcc.target/sparc/tls-ld-int8.c: Likewise.
	* gcc.target/sparc/tls-ld-uint16.c: Likewise.
	* gcc.target/sparc/tls-ld-uint32.c: Likewise.
	* gcc.target/sparc/tls-ld-uint8.c: Likewise.