kbuild: Silence output with make 3.80

In the top-level makefile escaped two lines to avoid launching a second subshell.
This make the build a bit less verbose with make V=0

Makefile

@@ -378,7 +378,7 @@ define rule_vmlinux__
 endef
 
 define rule_vmlinux
-	$(rule_vmlinux__)
+	$(rule_vmlinux__); \
 	$(NM) $@ | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
 endef
 
@@ -512,7 +512,7 @@ define filechk_version.h
 	if expr length "$(KERNELRELEASE)" \> $(uts_len) >/dev/null ; then \
 	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
 	  exit 1; \
-	fi;
+	fi; \
 	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
 	  echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
 	 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \