Static-check: Exclude s390x from dragonball and runtime-rs

At the moment, a project `dragonball` and `runtime-rs` does not support
for s390x. During the enablement, some errors due to the misconfiguration
of Makefile for `make check` and `make vendor` were identified.

This is to skip the build for the affected target of the projects.

Signed-off-by: Hyounggyu Choi <Hyounggyu.Choi@ibm.com>

src/dragonball/Makefile

@@ -5,7 +5,7 @@
 include ../../utils.mk
 
 ifeq ($(ARCH), s390x)
-default build check test clippy:
+default build check test clippy vendor:
 	@echo "s390x not support currently"
 	exit 0
 else

src/runtime-rs/Makefile

@@ -461,8 +461,14 @@ clean:
 vendor:
 	@cargo vendor
 
+ifeq ($(ARCH),x86_64)
 ##TARGET check: run test
 check: $(GENERATED_FILES) standard_rust_check
+else
+check:
+	@echo "$(ARCH) is not currently supported"
+	exit 0
+endif
 
 ##TARGET run: build and run agent
 run: