Warning when compiling with -pedantic, and fix

When compiling with -pedantic, gcc complains:

util/neo_err.h:75:25: warning: ISO C does not permit named variadic 
macros
util/neo_err.h:89:31: warning: ISO C does not permit named variadic 
macros
util/neo_err.h:126:28: warning: ISO C does not permit named variadic 
macros

After replacing:

#ifdef __GNUC__
#define nerr_raise(e,f,a...) \
   nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,##a)
#else
#define nerr_raise(e,f,...) \
   nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
#endif

with:

#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#define nerr_raise(e,f,...) \
   nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
#elif __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 4)
#define nerr_raise(e,f,a...) \
   nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,##a)
#else
#error The compiler is missing support for variable-argument macros.
#endif

gcc no longer complains, and everything is fine ;)