wingrass (standalone): use bash instead of cmd (workaround for missing completion and python's MAX_REPEAT problem)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57652 15284696-431f-4ddb-bdfa-cd5b030d7da7

mswindows/env.bat

@@ -2,6 +2,8 @@ rem
 rem Environmental variables for GRASS stand-alone installer
 rem
 
+set GRASS_SH=%GISBASE%\msys\bin\sh.exe
+
 set GRASS_HTML_BROWSER=explorer
 
 set GRASS_PYTHON=%GISBASE%\extrabin\python.exe