RISC-V: Add builtin .def file dependencies

riscv-builtins.cc includes riscv-cmo.def and riscv-scalar-crypto.def
(making dependencies) but their dependencies must be explicitly defined at
the configuration file, t-riscv.

They were the last two .def files without correct dependency information.

gcc/ChangeLog:

	* config/riscv/t-riscv: Add dependencies for riscv-builtins.cc,
	riscv-cmo.def and riscv-scalar-crypto.def.

gcc/config/riscv/t-riscv

@@ -8,7 +8,9 @@ riscv-builtins.o: $(srcdir)/config/riscv/riscv-builtins.cc $(CONFIG_H) \
   $(DIAGNOSTIC_CORE_H) $(OPTABS_H) $(RISCV_BUILTINS_H) \
   $(srcdir)/config/riscv/riscv-ftypes.def \
   $(srcdir)/config/riscv/riscv-vector-builtins-types.def \
-  $(srcdir)/config/riscv/riscv-modes.def
+  $(srcdir)/config/riscv/riscv-modes.def \
+  $(srcdir)/config/riscv/riscv-cmo.def \
+  $(srcdir)/config/riscv/riscv-scalar-crypto.def
 	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) \
 		$(srcdir)/config/riscv/riscv-builtins.cc