[Bug-wget] Check for flex before compiling

[Darshit Shah]

I've often seen people asking for help compiling Wget because a file, css.c 
cannot be found. This occurs because Flex is required to generate that file. 
However, configure does not attempt to check if flex is installed on the system.

I believe that even if a dependency is documented in the README files, the 
configure script **MUST** check for it before continuing. Hence, I'd like to 
push this patch which checks for the existence of flex before continuing.

--
Thanking You,
Darshit Shah

0001-Check-for-flex-in-configure.patch
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