Fix the above fix: if suexec is enabled, avoid destroying r->url

while obtaining the /~user and save the username in a separate data
area so that it won't be overwritten by the call to getgrgid(), and
fix some misuse of the pool string allocation functions.  Also fixes
a general problem with parsing URL query info into args for CGI scripts.
Closes PR#339, 367, 354, 453.

Reviewed by: Dean Gaudet, Randy Terbush


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78029 13f79535-47bb-0310-9956-ffa450edef68