Add in bits necessary to use -DUSE_PERL_SSI with an

	sfio enabled Perl.

Reviewed by:	Jim Jagielski, Rob Hartill
Submitted by:	Doug MacEachern


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78239 13f79535-47bb-0310-9956-ffa450edef68