Consistently use TEST_f_f1 in gamma tests

[Andreas Jaeger]

On 05/06/2013 05:00 PM, Joseph S. Myers wrote:
> Similarly to my fix for lgamma_test, gamma_test in libm-test.inc also
> should consistently use TEST_f_f1 to test signgam value (using IGNORE
> when the value is unspecified) to make conversion to data-driven tests
> easier.  This patch makes that change.  Tested x86_64.

Thanks, this is ok,

Andreas
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