clean also vdigit and nviz subdir

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@36956 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/Makefile

@@ -2,6 +2,7 @@ MODULE_TOPDIR = ../..
 
 SUBDIRS = docs scripts vdigit nviz
 EXTRA_CLEAN_FILES = menustrings.py
+CLEAN_SUBDIRS = vdigit nviz
 
 include $(MODULE_TOPDIR)/include/Make/Dir.make
 include $(MODULE_TOPDIR)/include/Make/Doxygen.make