superficial readability improvements.

I started off just trying to figure out how I could coerce this (great) script to also `CLANG_BUILD_EXAMPLES`, (which I still haven't figured out).. but along the way, made these changes... that simply make the script easier to follow / read, etc.  I have some other ideas.. but will hold off, as I don't know how amicable to changes you are.. understandably.

let me know... am def. willing to scale back or alter some of this if it makes it more palitibale.  to be honest I did it a few weeks ago, don't recall all my motives..  I think a lot of it was just lining up `=` to make it more clear what was getting set in which switch...


BTW, if you have any advice as to where I can set `CLANG_BUILD_EXAMPLES`, it would be appreciated.  I tried in SEVERAL places.. to no avail..