change default to dynamic boost libraries

6 jobs for master
Status Name Job ID Coverage
  Test
passed clang-c++11 #4171
Linux

00:04:40

passed clang-c++98 #4173
Linux

00:04:02

passed gcc-c++11 #4170
Linux

00:06:11

passed gcc-c++98 #4172
Linux

00:04:30

passed macos-c++11 #4174
Apple

00:02:24

passed macos-c++98 #4175
Apple

00:03:20