Add some sanity checks to the mrbind bat scripts, to prevent them fro… (#5830)

* Add some sanity checks to the mrbind bat scripts, to prevent them from being ran from the VS dev prompt.

* Explain why we don't want the scripts to run from the VS dev prompt.

Author: adalisk-emikhaylov

scripts/mrbind/install_deps_windows_msys2.bat

@@ -9,6 +9,14 @@ rem some other MSYS2 copy.
 
 setlocal
 
+rem Make sure we're not running from the VS dev prompt.
+rem Doing this just in case. `scripts/mrbind/install_mrbind_windows_msys2.bat` is known not to work there,
+rem   but this script could possibly work. But it's easier to not support this.
+if not "%VCToolsInstallDir%" == "" (
+    echo Must not run this script from the VS developer command prompt. Use the regular terminal.
+    exit /b 1
+)
+
 if "%MSYS2_DIR%" == "" set MSYS2_DIR=C:\msys64_meshlib_mrbind
 if "%CLANG_VER%" == "" set /p CLANG_VER=<%~dp0\clang_version_msys2.txt
 

scripts/mrbind/install_mrbind_windows_msys2.bat

@@ -8,6 +8,13 @@ setlocal
 rem Push enable extensions (for `mkdir` to behave like Linux `mkdir -p`).
 setlocal enableextensions
 
+rem Make sure we're not running from the VS dev prompt. It's known to break MRBind builds,
+rem   because it somehow forces MSYS2 CMake to use Vcpkg. Possibly via an env variable, I didn't investiate further.
+if not "%VCToolsInstallDir%" == "" (
+    echo Must not run this script from the VS developer command prompt. Use the regular terminal.
+    exit /b 1
+)
+
 if "%MSYS2_DIR%" == "" set MSYS2_DIR=C:\msys64_meshlib_mrbind
 
 if "%MRBIND_DIR%" == "" set MRBIND_DIR=%~dp0\..\..\thirdparty\mrbind