build: fix pkg-config search for libnghttp2
The configure script was searching for 'nghttp2' whereas the actual name of the package is 'libnghttp2'.
This change also removes the hack for libcares in one fell swoop.
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The configure script was searching for 'nghttp2' whereas the actual name of the package is 'libnghttp2'.
This change also removes the hack for libcares in one fell swoop.