add mnt support

Author: rcitach

bsp/xuantie/virt64/c906/applications/SConscript

@@ -4,6 +4,7 @@ import os
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
 src = ['main.c']
+src += ['mnt.c']
 
 group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)