Fix instrumentation target for old CMake versions

Older make versions do not support source files to be added to INTERFACE
type target. The source file is not needed there so it was removed.

common/CMakeLists.txt

@@ -3,7 +3,7 @@ add_subdirectory(config/yaml)
 
 configure_file(oai_version.h.in oai_version.h @ONLY)
 
-add_library(instrumentation INTERFACE instrumentation.h)
+add_library(instrumentation INTERFACE)
 target_include_directories(instrumentation INTERFACE .)
 if (TRACY_ENABLE)
   target_link_libraries(instrumentation INTERFACE Tracy::TracyClient)