[openbeosstorage] SK_TEST_* and old BeBooks

Hello,

I slightly changed the Jamrules file to define the macros SK_TEST_R5 and
SK_TEST_OBOS_POSIX for the compilation of the test app. Their values are 0
or 1 respectively, depending on which headers/libraries are used.
This should enable us to deal nicely with e.g. crashing R5 tests (just
#if !SK_TEST_R5 ... #endif enclose them) and different (but acceptable)
behavior for R5 and our stuff.

The second thing I want to mention is, that for deprecated, and hence
undocumented, API it is a good idea to have a look into older versions of
the BeBooks. Yep, obvious, but I hadn't thought of this before -- perhaps
I'm not the only one. ;-)
I don't know, if these old BeBooks are online somewhere. However, I've got
the CDs since BeOS PR, what should be enough. So, if someone needs any 
info, I'd be glad to forward it.

CU, Ingo

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