Minor waf recipe simplification.

libisc/wscript

@@ -19,10 +19,8 @@ def build(ctx):
 		features	= "c bld_include src_include",
 		source		= libisc_source,
 		includes	= [
-						"%s/libisc/include/" % ctx.srcnode.abspath(),
-						"%s/libisc/unix/include/" % ctx.srcnode.abspath() # XXX: platform: requires unix/win32 switch.
-
-					],
+				"%s/libisc/include/" % ctx.srcnode.abspath(),
+				],
 
 	)