pgsql: Don't install files for sslinfo when building without openssl.

Log Message:
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Don't install files for sslinfo when building without openssl.
Per Andrew Dunstan.

Modified Files:
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pgsql/src/tools/msvc:
Install.pm (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Install.pm.diff?r1=1.7&r2=1.8)