build: add missing comma in sources list
This commit adds a missing comma in the sources list. This effects at least window which produces the following warning where trace_event.h and src/util.h are concatenated:
Warning: Missing input files:
src\tracing\trace_event.hsrc\util.h
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
build