Log Message:
-----------
Add signal.h for sys_siglist reference.

Modified Files:
--------------
    pgsql/src/port:
        exec.c (r1.49 -> r1.50)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/exec.c.diff?r1=1.49&r2=1.50)

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	Subject: pgsql: Fix scalararraysel() to cope with binary-compatible cases, such