For reasons I cannot explain, running configure for libdivecomputer claims that
certain feature tests pass, even though those features demonstrably aren't
there. This is happening for two compiler warning flags (-Wrestrict &
-Wno-unused-but-set-variable) as well as the test for clock_gettime.
To work around this, we manually edit the config.h file and the created
Makefile before building libdivecomputer.
This happened on macOS 10.11.6 with clang-800.0.42.1 (part of Xcode 8.2.1).
Tangentially related to:
See #1263
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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