site/common-linux: move ac_cv_o_nonblock_inherited to site/common-linux
When compiling apr for no-powerpc arch, the flag ac_cv_o_nonblock_inherited
is always set to yes in cross compiling environment. This flag is intended to
think the socket, returned from accept(), inherit file status flags such as
O_NONBLOCK from the listening socket, but socket never inherits file status
from the listening socket on Linux (more information to man accept).
This is Linux-wide behaviour, so move it from meta/site/powerpc32-linux
to site/common-linux.
If ac_cv_o_nonblock_inherited is set to yes on Linux, clients can not access the
same ip address(URL) with Apache web server via http(port 80) and https(port443)
without redirection
