RISC-V: Add riscv-vsetvl.def to t-riscv

This patch will be backport to GCC 13 and commit to trunk.
gcc/ChangeLog:

	* config/riscv/t-riscv: Add riscv-vsetvl.def

Author: zhongjuzhe

gcc/config/riscv/t-riscv

@@ -62,7 +62,8 @@ riscv-vsetvl.o: $(srcdir)/config/riscv/riscv-vsetvl.cc \
   $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) $(REGS_H) \
   $(TARGET_H) tree-pass.h df.h rtl-ssa.h cfgcleanup.h insn-config.h \
   insn-attr.h insn-opinit.h tm-constrs.h cfgrtl.h cfganal.h lcm.h \
-  predict.h profile-count.h $(srcdir)/config/riscv/riscv-vsetvl.h
+  predict.h profile-count.h $(srcdir)/config/riscv/riscv-vsetvl.h \
+  $(srcdir)/config/riscv/riscv-vsetvl.def
 	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) \
 		$(srcdir)/config/riscv/riscv-vsetvl.cc