syscall: Fake uname to 4.19 for bpfloader/netd

* Google is attempting to kill 4.14 in https://android.googlesource.com/platform/system/bpf/+/0156d6e2ba1e90eecbd9ef47bcb39c41dcc78e53



Change-Id: Ic87a66753a7acc89b0fe5b19158eea4c58ba980f
Signed-off-by: Cyber Knight <cyberknight755@gmail.com>