Fix build.bat execution in nvim, echo executed msys command

Win/Scripts/msys2_env.bat

@@ -24,4 +24,5 @@ goto :eof
 set msys_env=%~1
 for /f "tokens=1,* delims= " %%a in ("%*") do set remaining_args=%%b
 
+echo [SCRIPT] Executing '%devenver_root%\MSYS2\20240113\msys2_shell.cmd -%msys_env% -no-start -defterm -here -c "%remaining_args%"'
 %devenver_root%\MSYS2\20240113\msys2_shell.cmd -%msys_env% -no-start -defterm -here -c "%remaining_args%"