Move os-util.[ch] to basic/

parse_os_release() will be used basic/hostname-util.c later on.

src/machine/image-dbus.c

@@ -18,6 +18,7 @@
 #include "loop-util.h"
 #include "missing_capability.h"
 #include "mount-util.h"
+#include "os-util.h"
 #include "process-util.h"
 #include "raw-clone.h"
 #include "strv.h"

src/machine/machined-dbus.c

@@ -24,6 +24,7 @@
 #include "machine-pool.h"
 #include "machined.h"
 #include "missing_capability.h"
+#include "os-util.h"
 #include "path-util.h"
 #include "process-util.h"
 #include "stdio-util.h"