configure: simplify zlib check #152
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This was referenced Feb 26, 2019
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This updates the zlib check to use the compiler itself to find
zlib.h. This fixes cases wherezlib.his inside the compiler's default search path, but not in the set of paths contained in the configure script. An example is #94, where macOS's builtin zlib has its headers in a path that the configure script doesn't know about.