meson: fix typo in function check that prevented checking for hstrerror

Nowhere in the codebase do we otherwise check for strerror. Nowhere in
the codebase do we make use of -DNO_STRERROR. `strerror` is not a
networking function at all.

We do utilize `hstrerror` though, which is a networking function we
should have been checking here.

Signed-off-by: Eli Schwartz <eschwartz@gentoo.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

meson.build

@@ -1088,7 +1088,7 @@ else
 endif
 libgit_dependencies += networking_dependencies
 
-foreach symbol : ['inet_ntop', 'inet_pton', 'strerror']
+foreach symbol : ['inet_ntop', 'inet_pton', 'hstrerror']
   if not compiler.has_function(symbol, dependencies: networking_dependencies)
     libgit_c_args += '-DNO_' + symbol.to_upper()
   endif