BUG #1634: Configure step for build does not define HAVE_POSIX_SIGNALS

The following bug has been logged online:

Bug reference:      1634
Logged by:          Don Courtney
Email address:      donald.courtney@sun.com
PostgreSQL version: 8.0/8.1
Operating system:   Solaris 10
Description:        Configure step for build does not define
HAVE_POSIX_SIGNALS
Details:

Subj: ./src/include/pg_config.h Does not define HAVE_POSIX_SIGNALS.

To recreate the problem on Solaris run the source build step for
configuring.

$ ./configure

Then

$ cd ./src/include

and see that there is no "1" in the define statement

#define HAVE_POSIX_SIGNALS

For postgres to run properly without ZOMBIE processes the workaround is to
hand edit this to:

  /* Define to 1 if you have the POSIX signal interface. */
#define HAVE_POSIX_SIGNALS 1    <---- ADD 1