objc++: more tests (also for objc)

[Peter Breitenlohner]

Hi Stefano,

here the additional tests for Objective C++ you have asked for.
While at it I also have created analogous tests for Objective C.

[PATCH 1/6] objc++: test global, per-target, and user flags: inspired lflags.sh.
[PATCH 2/6] objc: test global, per-target, and user flags: likewise.

[PATCH 3/6] objc++: test automatic dependency tracking: inspired by gcj3.sh.
[PATCH 4/6] objc: test automatic dependency tracking: likewise.

[PATCH 5/6] objc++: test more automatic dependency tracking: inspired by gcj4.sh
[PATCH 6/6] objc: test more automatic dependency tracking: likewise.

The last two test should probably been omitted because
(1) they require gcc/g++ supporting Objective C/C++, and
(2) I think they do not test anything beyond plain gcc?g++.

Note: I have not yet added the tests to t/list-of-tests.mk because
(A) adding them individually might just cause merge conflicts, and
(B) so far I have invoked them via 'make TEST=... check'.

Regards
Peter Breitenlohner <address@hidden>