Merge 1821767 from trunk:

LibreSSL doesn't have or require applink.c

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


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1826885 13f79535-47bb-0310-9956-ffa450edef68