firejail --build=FILE output

[rusty-snake]

For #2972 I often use --build=FILE and I noticed that there is often in long outputs something like: === tracelib init() [22.
Example:

whitelist /usr/share/=== tracelib init() [22
private-etc foo,host=== tracelib init() [16,bar

Only point in source code where this string is:
https://github.com/netblue30/firejail/blob/b9888e6a388b7d2c17f0aa75b2ef5205b4b90720/src/libtrace/libtrace.c#L102

[netblue30]

I took it out, just some debug code.

https://github.com/netblue30/firejail/commit/ee5ab63cfb1b4e38db4bc83bd51678fa0f25284c