Stephen Kelly d0af0faefb WCDH: Make the header -Wundef safe for the C language. ...

The __STDC_VERSION__ macro may be defined or not depending on the
implementation dialect of C.  Test that it is defined before testing
its value.

The CXX tests do not need such a change because they define __cplusplus
in all dialects.

2014-11-25 14:44:21 +01:00

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