fix unit test with old versions of boost

Gabriele Contini

2020-02-10 7cd73dd4f6ddec566c33596766c779beb873aa63

 src/library/pc_identifier/CMakeLists.txt

@@ -5,8 +5,6 @@
   disk_strategy.cpp
   pc_identifier.cpp
   default_strategy.cpp
	
   #pc-identifiers.c
)

if(CODE_COVERAGE AND UNIX)