sdcard: Link to cutils and libc as DSOs

There's no reason to link this statically, especially since we're
building a shared binary anyway. Reduce binary size from 108k to 18k

Change-Id: I0622f039080fa088348570048314121ea4e14587
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_system_core into cm-11.0