Fix for C++ compatibility

After commit 476b35d4e31, some buildfarm members are complaining about
not recognizing _Noreturn when building the new C++ module
test_cplusplusext.  This is not a C++ feature, but it was gated like

    #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
    #define pg_noreturn _Noreturn

But apparently that was not sufficient.  Some platforms define
__STDC_VERSION__ even in C++ mode.  (In this particular case, it was
g++ on Solaris, but apparently this is also done by some other
platforms, and it is allowed by the C++ standard.)  To fix, add a

    ... && !defined(__cplusplus)

Reviewed-by: Andres Freund <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/cageczqr21onnkizo_1rlwo0-16kg1jbxnvq-wymyw0-_1cu...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b4555cb070f134c04328df54ce31d4ef1970f3bb

Modified Files
--------------
src/include/c.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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