units: downgrade dependency on sockets.target/timers.target/paths.target by basic.target

There isn't really any need to require any targets but sysinit.target
from basic.target, so downgrade sockets.target, paths.target,
timers.target.

units/basic.target

@@ -8,6 +8,7 @@
 [Unit]
 Description=Basic System
 Documentation=man:systemd.special(7)
-Requires=sysinit.target sockets.target timers.target paths.target
+Requires=sysinit.target
+Wants=sockets.target timers.target paths.target
 After=sysinit.target sockets.target timers.target paths.target
 RefuseManualStart=yes