[Bug-wget] [Bug-Wget] Fix libpsl configure code

[Darshit Shah]

On Arch Linux, I realized that adding --with-libpsl to the configure code caused 
Wget to be compiled without libpsl support. Upon investigating, it turns out 
that the configure.ac code for libpsl did nothing in the case where 
--with{,out}-libpsl statements were added to the configure command.

I've attached a patch that fixes this. I know gscrivano is against using the 
with_* variables, but it seems to be the cleanest way forward. If you know of 
anything better, please do let me know.

--
Thanking You,
Darshit Shah

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