unittests: Remove double install for case 10
unittests: Remove double install for case 10

[why]
In test case 10 the project is installed twice. This has been introduced
with commit
  55abe16 unit tests: Test that relative install_rpath works correctly
where the cxx tests where added by copy and paste.

[how]
First test all build rpaths, then after install all install rpaths.

[note]
The aforementioned commit is a bit strange in that it adds a tests with
a relative rpath with cxx files but not with c files.

Signed-off-by: Fini Jastrow <df99dd64f50b60821f71f66742e94ffc417386fd@desy.de>

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