Error from signal.h when _POSIX_C_SOURCE == 1

[Christopher Wellons]

A two-line source file demonstrates this bug:

    #define _POSIX_C_SOURCE 1
    #include <signal.h>

Then when compiled:

    $ gcc -c tmp.c
    In file included from /usr/include/sys/signal.h:22:0,
                     from /usr/include/signal.h:6,
                     from tmp.c:2:
    /usr/include/cygwin/signal.h:328:34: error: unknown type name ‘siginfo_t’
         void  (*sa_sigaction) ( int, siginfo_t *, void * );
                                      ^

Since _POSIX_C_SOURCE < 199309L, siginfo_t isn't defined. However, 
cygwin/signal.h erroneously uses this type anyway when defining struct 
sigaction. The sa_sigaction field in struct sigaction must also be 
guarded by the same feature test macro.

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