#31 test failures on OS X

[Steven Jenkins]

Darwin ucf-cf-ppc-macosx-2 6.5 Darwin Kernel Version
6.5: Mon Apr 7 17:05:38 PDT 2003;
root:xnu/xnu-344.32.obj~1/RELEASE_PPC Power Macintosh
powerpc

test-func-div0, test-func-phase, and test-func-func
fail. The cause is redefining macro NAN, which is used
by platform math library.

[Steven Jenkins]

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Fixed in 3.11.1.