Support for timer_slack

Change-Id: Ie3da13e282eb8dcac1b7146fe7fcc03613be2318
Correct LOCAL_LDLIBS of adb

adb doesn't really use ncurses-libs, remove it.

Add -ldl for the symbols dlclose, dlerror, dlopen...
introduced from dso_dlfcn.c of libcrypto_static.a.

Change-Id: If1cc23987a9b35ec535bbf8f4e7db141b9f10af7