libuEv v1.4.1

Changes

• Add some pkg-config integration tips for developers using libuEv
  with GNU autotools in their projects.

Fixes

• Add missing SFD_CLOEXEC and TFD_CLOEXEC to signal and timer file
  descriptors. This prevents these file descriptors from "leaking" into
  sub-processes of the parent thread. The kernel will atomically close
  these descriptors for forked-off children calling the exec*() family
  of syscalls.
• Minor coding style fixes and simplification of build scripts.