add macos strip state checking

[dothebart]

detecting whether binaries on mac are stripped is a PITA. The cheapest way of doing so is:

• create a copy of the file in /tmp/test_this_file using the python pathlib
• invoke strip on /tmp/test_this_file
• compare the filesize of the original file and this file. If they match, source was stripped - if not - not.
• delete temporary file.

Part of this: research howto invoke strip, try on the shell in advance. Maybe stripped files change in size anyways? The build-folder on the CI should have a makefile invoking strip, hence this can be used for getting the syntax.
After revalidating that this approach is viable with a go binary (i.e. starter => not stripped) and and a c++ binary (arangod => stripped) on the interactive shell,
The implementation of this can be done on linux, since strip is also available there too.