This effectively renames --with-system-odbc-headers to --with-system-odbc.

Signed off by Petr Mladek

It seams that only Mac OS X uses the echo -n option in make files. I think
I fixed all the references this time.

Also cleans up some trailing white space.

* make id: create GNU idutils symbol lookup index
* make tags: create ctags index file (c++, java, html)
* make docs: create doxygen-style documentation below docs/