[strace/strace] Print SELinux contexts when enabling "--secontext" (not compatible with "-c"). (#121)

[Renaud Métrich]

Hello @ldv-alt , by the way your talks at Decvonf were great :-)

The CI is failing for some weird reason: I'm now linking with `-ldl` added to Makefile.am but this fails on line 3016 (e.g. https://travis-ci.org/strace/strace/jobs/643826833?utm_medium=notification&utm_source=github_status):
~~~
gcc -m32 -Wall -Wempty-body -Wformat-security -Wignored-qualifiers -Wimplicit-fallthrough=5 -Winit-self -Wlogical-op -Wmissing-parameter-type -Wnested-externs -Wold-style-declaration -Wold-style-definition -Woverride-init -Wsign-compare -Wtype-limits -Wwrite-strings -Werror   -g -O2 -ldl ...
~~~

The `-ldl` is specified, but apparently symbols are not there:
~~~
/home/travis/build/strace/strace/strace-5.4.0.87.4c3c/_build/sub/../../strace.c:2023: undefined reference to `dlopen'
/home/travis/build/strace/strace/strace-5.4.0.87.4c3c/_build/sub/../../strace.c:2025: undefined reference to `dlsym'
/home/travis/build/strace/strace/strace-5.4.0.87.4c3c/_build/sub/../../strace.c:2027: undefined reference to `dlsym'
/home/travis/build/strace/strace/strace-5.4.0.87.4c3c/_build/sub/../../strace.c:2029: undefined reference to `dlsym'
/home/travis/build/strace/strace/strace-5.4.0.87.4c3c/_build/sub/../../strace.c:2030: undefined reference to `dlerror'
/home/travis/build/strace/strace/strace-5.4.0.87.4c3c/_build/sub/../../strace.c:2032: undefined reference to `dlerror'
~~~

I'm no Automake expert, so maybe I just added the lib to wrong place.

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