build: Fix building error for c-ares library on macOS
build: Fix building error for c-ares library on macOS

In macOS SDK, <arpa/nameser.h> always exists but CHECK_INCLUDE_FILES
fails due to non-normal header installation on macOS SDK.
Recently, c-ares starts to provide nameser.h related interface:
https://github.com/c-ares/c-ares/commit/7712fcd17847998cf1ee3071284ec50c5b3c1978

The above commit causes definition conflicts on macOS that kicks
compilation error on c-ares.

Signed-off-by: Hiroshi Hatake <a476a6e5b5893650242fbf0b2961500a9bd9032e@calyptia.com>

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