deps: use nghttp2's config.h on all platforms
Fix warnings about use of htonl(), etc. by including config.h for all platforms, defining HAVE_ARPA_INET_H on non-Windows, and therefore including <arpa/inet.h>, which defines the host to network byte order conversion functions.
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This works on Linux, I'll see what ci says about the other platforms.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines