liblog: fix build again

log_read.c has to be in the target sources on all platforms, but
never needs to be in the host sources.

(cherry picked from commit 3c37fae4a472835c8e20060e1e6b7495b84f254a)

Change-Id: Ie0829f3f1daf16d151c401653dbef603b1c2f59d
1 file changed