Unfortunately that's a bad/buggy Makefile to build the theme, the only way would be patch it out after svn update... any changes would of course be lost on next update, so...
And it installs only at user level (not system wide) but with root ownerships!
I made a new e17-svn version that leave b_and_w out for the time been.
Users that want it must either remove it from skip list and fixes things by hand, keep it on skip, get the code and compile directly with build.sh script included (for edje_cc) or use the OzOS update_e17 tool to update that ensures sane install of the theme.
I'll keep an eye on it to see if Makefile gets fixed so i can put it back by default.