prevent journald from being built on ARM

Signed-off-by: Govinda Fichtner <govinda.fichtner@googlemail.com>

daemon/logger/journald/journald.go

@@ -1,4 +1,4 @@
-// +build linux
+// +build linux,!arm
 
 // Package journald provides the log driver for forwarding server logs
 // to endpoints that receive the systemd format.

daemon/logger/journald/journald_unsupported.go

@@ -1,4 +1,4 @@
-// +build !linux
+// +build !linux linux,arm
 
 package journald
 

daemon/logger/journald/read.go

@@ -1,4 +1,4 @@
-// +build linux,cgo,!static_build,journald
+// +build linux,cgo,!static_build,journald,!arm
 
 package journald
 

daemon/logger/journald/read_unsupported.go

@@ -1,4 +1,4 @@
-// +build !linux !cgo static_build !journald
+// +build !linux !cgo static_build !journald linux,arm
 
 package journald