Fix build.cmd/sh for src/Mvc (#6208)

Author: natemcmaster

src/Mvc/build.cmd

@@ -1,3 +1,3 @@
 @ECHO OFF
-SET RepoRoot="%~dp0..\.."
-%RepoRoot%\build.cmd -All -RepoRoot %~dp0 %*
+SET RepoRoot=%~dp0..\..
+%RepoRoot%\build.cmd -projects %~dp0\**\*.*proj %*

src/Mvc/build.sh

@@ -4,4 +4,4 @@ set -euo pipefail
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 repo_root="$DIR/../.."
-"$repo_root/build.sh" -All -RepoRoot "$DIR" "$@"
+"$repo_root/build.sh" --projects "$DIR/**/*.*proj" "$@"