[pool] Test cases need to link with boost_system DSO on Linux

[Petr Machata <pmachata@…>]

Currently running the test suite for Boost.Pool gives me messages like the following:

/home/petr/rpmbuild/BUILD/boost_1_53_0/tests-out/boost/bin.v2/libs/pool/test/test_simple_seg_storage.test/gcc-4.8.1/debug/test_simple_seg_storage.o: In function `__static_initialization_and_destruction_0':
/home/petr/rpmbuild/BUILD/boost_1_53_0/libs/pool/test/../../../boost/system/error_code.hpp:214: undefined reference to `boost::system::generic_category()'
/home/petr/rpmbuild/BUILD/boost_1_53_0/libs/pool/test/../../../boost/system/error_code.hpp:215: undefined reference to `boost::system::generic_category()'
/home/petr/rpmbuild/BUILD/boost_1_53_0/libs/pool/test/../../../boost/system/error_code.hpp:216: undefined reference to `boost::system::system_category()'

I'm not sure whether Boost.Pool uses Boost.System directly, but on Linux, linking with Boost.System DSO is commonly needed also when one uses Boost.Thread header files.

I'm attaching a patch that fixes the obvious cases. Unfortunately I don't know enough Jam magic to fix the valgrind invocations as well.

[Petr Machata <pmachata@…>]

A fix.

[Jonathan Wakely <jwakely.boost@…>]

Updated patch for 1.58.0 and 1.59.0