r2744: ben elliston taught me about gcov today, which allows you to measure

r2744: ben elliston taught me about gcov today, which allows you to measure
the % coverage in terms of lines of code of a test suite. I thought a
good first place to start with gcov was the talloc test suite. When I
started the test suite covered about 60% of all lines of code in
talloc.c, and now it covers about 99%. The only lines not covered are
talloc corruption errors, as that would cause smb_panic() to fire.

It will be interesting to try gcov on the main Samba test suite for
smbd. We won't achieve 100% coverage, but it would be nice to get to
90% or more.

I also modified the talloc.c sources to be able to be build standalone, using:

  gcc -c -D_STANDALONE_ -Iinlcude lib/talloc.c

that should make it much easier to re-use talloc in other projects