PR#695: fix problem compiling http_bprintf.c with gcc under SCO

Submitted by:        Marc Slemko
Reviewed by: Dean Gaudet, Randy Terbush


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3@78503 13f79535-47bb-0310-9956-ffa450edef68