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Using the compiler option -std=c99 allows this test to pass. 
Perhaps adding the macro 
AC_PROG_CC_C99
to autoconf to add the right compiler option might be a solution. I know Solaris headers are often quite strict, and will not define something in a header file if the right things are not defined to indicate C99. 
I would add, there is quite a serious problem on Solaris with _socket failing to build. 
http://bugs.python.org/issue8852
Unless one uses that workaround, which is not committed to the python source code yet, one can not run any tests of python.