external/kernel-headers: add signalfd.h

Obtained from kernel 3.4.5

(cherry-pick of cedf2ae6c7c1cd8c70bb3380543d618a01424895.)

Change-Id: If3bcae497da4e73aa88614abc82b297d44df8bdc
1 file changed
tree: 38e62665487cdb740cdec81f985f5253d29c661d
  1. original/
  2. CleanSpec.mk