Turn down MSVC compiler verbosity

Most of what is produced by the detailed verbosity level is of no
interest at all, so switch to the normal level for more usable output.

Christian Ullrich

Backpatch to all live branches

src/tools/msvc/build.pl

@@ -56,7 +56,7 @@ if ($buildwhat)
 }
 else
 {
-    system("msbuild pgsql.sln /verbosity:detailed /p:Configuration=$bconf");
+    system("msbuild pgsql.sln /verbosity:normal /p:Configuration=$bconf");
 }
 
 # report status