Revert "filesystem_config: Allow executables in /system/libexec"

This reverts commit 7bdb2fa0808e65389c803a0b3cf4a8f1e1a3802a.
De-unnecissarily-linaro charger/Android.mk

Change-Id: Ib8e9946d2f213630eaf121c931f6dccb73415ecd
Revert "healthd: allow devices to provide their own libhealthd"

This reverts commit 937971558a0f6c920fe63999513eccb6f2ceb23a.