vcbuild optional packages

This patch fixes vcbuild so you can build without OpenSSL and libz
should you want to. This disables the sslinfo and pgcrypto modules
because they require the libraries to build at all.

//Magnus
Index: src\tools\msvc/mkvcbuild.pl
===================================================================
RCS file: c:/prog/cvsrepo/pgsql/pgsql/src/tools/msvc/mkvcbuild.pl,v
retrieving revision 1.8
diff -c -r1.8 mkvcbuild.pl
*** src\tools\msvc/mkvcbuild.pl    21 Nov 2006 17:54:26 -0000    1.8
--- src\tools\msvc/mkvcbuild.pl    8 Jan 2007 19:49:13 -0000
***************
*** 182,203 ****
      push @contrib_excludes,'xml2';
  }

! # Pgcrypto makefile too complex to parse....
! my $pgcrypto = $solution->AddProject('pgcrypto','dll','crypto');
! $pgcrypto->AddFiles('contrib\pgcrypto','pgcrypto.c','px.c','px-hmac.c','px-crypt.c',
!         'crypt-gensalt.c','crypt-blowfish.c','crypt-des.c','crypt-md5.c','mbuf.c',
!         'pgp.c','pgp-armor.c','pgp-cfb.c','pgp-compress.c','pgp-decrypt.c','pgp-encrypt.c',
!         'pgp-info.c','pgp-mpi.c','pgp-pubdec.c','pgp-pubenc.c','pgp-pubkey.c','pgp-s2k.c',
!         'pgp-pgsql.c');
! if ($solution->{options}->{openssl}) {
!     $pgcrypto->AddFiles('contrib\pgcrypto', 'openssl.c','pgp-mpi-openssl.c');
  }
! else {
!     $pgcrypto->AddFiles('contrib\pgcrypto', 'md5.c','sha1.c','sha2.c','internal.c','internal-sha2.c',
!             'blf.c','rijndael.c','fortuna.c','random.c','pgp-mpi-internal.c','imath.c');
  }
- $pgcrypto->AddReference($postgres);
- $pgcrypto->AddLibrary('wsock32.lib');

  my $D;
  opendir($D, 'contrib') || croak "Could not opendir on contrib!\n";
--- 182,210 ----
      push @contrib_excludes,'xml2';
  }

! if (!$solution->{options}->{openssl}) {
!    push @contrib_excludes,'sslinfo';
  }
!
! # Pgcrypto makefile too complex to parse....
! # Pgcrypto requires zlib
! if ($solution->{options}->{zlib}) {
!    my $pgcrypto = $solution->AddProject('pgcrypto','dll','crypto');
!    $pgcrypto->AddFiles('contrib\pgcrypto','pgcrypto.c','px.c','px-hmac.c','px-crypt.c',
!            'crypt-gensalt.c','crypt-blowfish.c','crypt-des.c','crypt-md5.c','mbuf.c',
!            'pgp.c','pgp-armor.c','pgp-cfb.c','pgp-compress.c','pgp-decrypt.c','pgp-encrypt.c',
!            'pgp-info.c','pgp-mpi.c','pgp-pubdec.c','pgp-pubenc.c','pgp-pubkey.c','pgp-s2k.c',
!            'pgp-pgsql.c');
!    if ($solution->{options}->{openssl}) {
!        $pgcrypto->AddFiles('contrib\pgcrypto', 'openssl.c','pgp-mpi-openssl.c');
!    }
!    else {
!        $pgcrypto->AddFiles('contrib\pgcrypto', 'md5.c','sha1.c','sha2.c','internal.c','internal-sha2.c',
!                'blf.c','rijndael.c','fortuna.c','random.c','pgp-mpi-internal.c','imath.c');
!    }
!    $pgcrypto->AddReference($postgres);
!    $pgcrypto->AddLibrary('wsock32.lib');
  }

  my $D;
  opendir($D, 'contrib') || croak "Could not opendir on contrib!\n";