Vote for r1751970

Vote for r1751970

Tested manually and verified httpd's mod_proxy_fcgi logs with various request types
(with/without query string, long query strings, etc..).
My only doubt was related to the '\0' terminator placed in the middle of the char array,
but after a chat with Eric on IRC I got a clear view of what happens (only the chars up
to the \0 terminator are placed in FCGI headers later on).
Last but not the least, in the bugzilla ticket the original requestor tested the change
and stated that solved his problem. Looks good to me for backport!

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1754272 13f79535-47bb-0310-9956-ffa450edef68