[BusyBox] added httpd CGI features

[Peter Willis]

Hi all. Long time user, first time contributer. I recently added two new
features to httpd in busybox-1.00-pre5 which I thought were useful so I made
a little patch. 

The two features are ExecPerm and DefaultDir. ExecPerm allows any executable
file outside the cgi-bin directory to be executed as a CGI program.
DefaultDir allows the execution of an index.cgi program in place of an
index.html file.

I apologise in advance for the quality of the code; C isn't my first
language ;-)

-- 

'Twas midnight, and the UNIX hacks
Did gyre and gimble in their cave
All mimsy was the CS-VAX
And Cory raths outgrabe.
 
"Beware the software rot, my son!
The faults that bite, the jobs that thrash!
Beware the broken pipe, and shun
The frumious system crash!"
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