Update journal_send.cc
Update journal_send.cc

Make it possible to have more meaningful CODE_FILE, CODE_LINE and CODE_FUNC instead of them always pointing to journal_send.cc.

 CODE_FILE, CODE_LINE and CODE_FUNC can be populated from a stack trace, for example using the npm module callsite.
jue89/node-systemd-journald,jue89/node-systemd-journald,jue89/node-systemd-journald