Merge r683280 from trunk:

* modules/ssl/ssl_engine_io.c (char_buffer_read): Use memmove in place
  of memcpy since the buffers can overlap; add explanatory comment.

PR: 45444

Submitted by: jorton
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@984169 13f79535-47bb-0310-9956-ffa450edef68