[rsyslog] patch for architectures without atomic builtins

[Sledz, Steffen]

Hi,

we want to use rsyslogd on an embedded system with an armv5te cpu.
Unfortunately the gcc/libc we have to use for this system do not support
atomic builtins which are vital for rsyslog at the moment. :(

Therefor we created a patch which emulates the atomic builtins
with posix semaphores. This patch should fit to the 5.4.x and
5.5.x versions.

We would be glad if this patch could help to bring rsyslog to
more platforms.

Steffen