pgsql: Turn build and vcregress .bat files into pure one line wrappers

Log Message:
-----------
Turn build and vcregress .bat files into pure one line wrappers for
the perl scripts. Remove the now superfluous getregress.pl.

Modified Files:
--------------
    pgsql/src/tools/msvc:
        Install.pm (r1.21 -> r1.22)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Install.pm?r1=1.21&r2=1.22)
        build.bat (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/build.bat?r1=1.9&r2=1.10)
        vcregress.bat (r1.14 -> r1.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/vcregress.bat?r1=1.14&r2=1.15)

Removed Files:
-------------
    pgsql/src/tools/msvc:
        getregress.pl
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/getregress.pl)