More fixes for path of compile tests

[mborland]

No description provided.

[pdimov]

Wouldn't it be easier to use INCLUDE_DIRECTORIES ../include_private in test/CMakeLists.txt? That's what test/Jamfile does:

math/test/Jamfile.v2

Line 75 in 5229890

<include>../include_private

Also, boost_test[_jamfile] supports global variables such as BOOST_TEST_LINK_LIBRARIES (and BOOST_TEST_INCLUDE_DIRECTORIES) that can be used to factor out the common parts. These are the equivalent of putting things in Jamfile's project requirements.