* 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


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@683280 13f79535-47bb-0310-9956-ffa450edef68