Merge r1826845 from trunk:

mod_slotmem_shm: SHMs need to be attached in MPM winnt children processes.

We can't (re-)create them since they exist already and are owned by the
parent process.


Submitted by: ylavic
Reviewed by: ylavic, covener, rjung


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1826897 13f79535-47bb-0310-9956-ffa450edef68