recursively call unit test executable

hi all,

i'm currently having some trouble with b2: to test lockfree with
interprocess, i'm calling the executable itself:

https://github.com/boostorg/lockfree/blob/master/test/queue_interprocess_test.cpp#L38

`std::system()` isn't able to resolve the dynamic libraries, so it fails
with:
> dyld: Library not loaded: libboost_chrono.dylib
>   Referenced from: /Users/tim/dev/boost/libs/lockfree/test/../../../bin.v2/libs/lockfree/test/queue_interprocess_test.test/darwin-4.2.1/debug/threadapi-pthread/threading-multi/visibility-hidden/queue_interprocess_test
>   Reason: image not found

this seems to be the case because the binaries lack the rpath:
> 13:36 $ otool -L ../../../bin.v2/libs/lockfree/test/queue_interprocess_test.test/darwin-4.2.1/debug/threadapi-pthread/threading-multi/visibility-hidden/queue_interprocess_test
> ../../../bin.v2/libs/lockfree/test/queue_interprocess_test.test/darwin-4.2.1/debug/threadapi-pthread/threading-multi/visibility-hidden/queue_interprocess_test:
> 	libboost_chrono.dylib (compatibility version 0.0.0, current version 0.0.0)
> 	libboost_unit_test_framework.dylib (compatibility version 0.0.0, current version 0.0.0)
> 	libboost_thread.dylib (compatibility version 0.0.0, current version 0.0.0)
> 	libboost_system.dylib (compatibility version 0.0.0, current version 0.0.0)
> 	libboost_atomic.dylib (compatibility version 0.0.0, current version 0.0.0)
> 	/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 400.9.4)
> 	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.200.5)


any idea how to make this work?

tia,
tim
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