Stephen Kelly 462c630b8a Features: Don't test __cplusplus value for CXX98 on GNU.
The macro is defined to 1 for GNU 4.6, and such a test is only
useful for features in language dialects newer than the
default (CXX98 for GNU currently).

Test only that it has a truthy value.
2015-01-15 22:13:22 +01:00
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