[testsuite] [sparc] skip sparc-ret-1 with -mfix-ut699

[testsuite] [sparc] skip sparc-ret-1 with -mfix-ut699

Option -mfix-ut699 changes the set of instructions that can be placed
in the delay slot, preventing the expected insn placement.  Skip the
test if the option is present.

for  gcc/testsuite/ChangeLog

	* gcc.target/sparc/sparc-ret-1.c: Skip on -mfix-ut699.