base.bbclass: Add base_contains function - Can be used to check if a string is present in a variable.

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@547 311d38ba-8fff-0310-9ca6-ca027cbcb966

meta/classes/base.bbclass

@@ -39,6 +39,13 @@ def base_conditional(variable, checkvalue, truevalue, falsevalue, d):
 	else:
 		return falsevalue
 
+def base_contains(variable, checkvalue, truevalue, falsevalue, d):
+       import bb
+       if bb.data.getVar(variable,d,1).find(checkvalue) != -1:
+               return truevalue
+       else:
+               return falsevalue
+
 DEPENDS_prepend="${@base_dep_prepend(d)} "
 
 def base_set_filespath(path, d):