[Bug-wget] [Patch] Use -isystem in Makefile to suppress warnings from libraries

[Darshit Shah]

A recent GCC / LLVM update has caused my setup to spew far too many
warnings on compiling Wget. On a closer look, they all come from
Gnulib code. I propose the attached patch to explicitly mark those
files as libraries and have the compiler suppress warnings from them.
This way we can focus on the warnings generated by Wget codebase
alone.

-- 
Thanking You,
Darshit Shah

0001-Explicitly-mark-lib-directories-in-Makefile.patch
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