roken: prevent rk_mkdir recursion due to macro
roken: prevent rk_mkdir recursion due to macro

rk_mkdir() should not be redefined to mkdir() nor should mkdir()
be redefined to rk_mkdir() when compiling lib/roken/mkdir.c

Change-Id: I329fd2eb5794548635d33218a65df8958746a6f9

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal