Update epoll.h from bionic

Change-Id: I0c1c8180bcfab5022d5dcdcb5c768a17b9d77f16
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
Merge "Update epoll.h from bionic"
Update signal.h from bionic with transition from SIGRTMIN to __SIGRTMIN

Update signal.c for build with old platforms

Change-Id: Ica87465a73004c0885d51e384acd4f42947cc19b
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
Fix repo script to ignore tools

Change-Id: I80e6d5802f9a4633378d432eff3e91c2fcf83eeb
Merge "Fix repo script to ignore tools"
Remove SDK tools from build.

(cherry picked from commit 1678734ef064893f28390fac16f4633d0fb7361a)

Change-Id: Ia689f66868de18341b863e19f2958434eb45ca59
Merge "Remove SDK tools from build."
Merge "Update signal.h from bionic with transition from SIGRTMIN to __SIGRTMIN"
auto-merger: merge in from aosp/master