[bind10-dev] require libboost_thread?

[Jeremy C. Reed]

As a side effect of being removed on Debian:

run_unittests-hash_deleter_unittest.o: In function 
`isc::nsas::HashDeleterTest::HashDeleterTest()':
hash_deleter_unittest.cc:(.text._ZN3isc4nsas15HashDeleterTestC2Ev[isc::nsas::HashDeleterTest::HashDeleterTest()]+0x506): 
undefined reference to 
`boost::thread_resource_error::thread_resource_error()'
hash_deleter_unittest.cc:(.text._ZN3isc4nsas15HashDeleterTestC2Ev[isc::nsas::HashDeleterTest::HashDeleterTest()]+0x50c): 
undefined reference to 
`boost::thread_resource_error::~thread_resource_error()'
hash_deleter_unittest.cc:(.text._ZN3isc4nsa
...

But I don't have that problem on Solaris with GCC.