pgsql: Add basic build support for Visual Studio 2008, without resorting

Log Message:
-----------
Add basic build support for Visual Studio 2008, without resorting to
generating the build files for 2005 and then converting them.

Modified Files:
--------------
    pgsql/src/tools/msvc:
        Project.pm (r1.21 -> r1.22)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Project.pm?r1=1.21&r2=1.22)
        Solution.pm (r1.48 -> r1.49)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Solution.pm?r1=1.48&r2=1.49)