xcopy can only deal with forward-slashed paths when it's quoted - needed

for "vcregress check" to work.
Per report from Dave Page.

src/tools/msvc/Install.pm

@@ -3,7 +3,7 @@ package Install;
 #
 # Package that provides 'make install' functionality for msvc builds
 #
-# $PostgreSQL: pgsql/src/tools/msvc/Install.pm,v 1.6 2007/03/29 20:48:26 mha Exp $
+# $PostgreSQL: pgsql/src/tools/msvc/Install.pm,v 1.7 2007/04/02 12:11:26 mha Exp $
 #
 use strict;
 use warnings;
@@ -67,6 +67,8 @@ sub Install
     CopyIncludeFiles($target);
 
     GenerateNLSFiles($target,$config->{nls}) if ($config->{nls});
+
+    print "Installation complete.\n";
 }
 
 sub EnsureDirectories
@@ -336,7 +338,7 @@ sub CopyIncludeFiles
 
         EnsureDirectories($target . '/include/postgresql/server', $d);
         system(
-            "xcopy /s /i /q /r /y src\\include\\$d\\*.h $target\\include\\postgresql\\server\\$d\\")
+            "xcopy /s /i /q /r /y src\\include\\$d\\*.h \"$target\\include\\postgresql\\server\\$d\\\"")
           && croak("Failed to copy include directory $d\n");
     }
     closedir($D);