Print EPERM warning #16
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This brings down `su-exec` to 11kB and `su-exec-static` to 853kB on my Ubuntu 16.04 x86_64.
Static linking to GNU libc is not really allowed, and I am using GNU libc for my purposes (running Java on CentOS and Fedora). Being able to do "make install" makes packaging su-exec as an RPM easier.
http://www.linuxjournal.com/article/1158 used as reference.
Addresses ncopa#7
The far most likely cause for EPERM is that people try to run su-exec as a non-root user, so help them understand this is not possible.
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Print an extra, descriptive warning for
EPERM. The far most likely cause forEPERMis that people try to run su-exec as a non-root user, so help them understand this is not possible. This addresses issue 10.This pull request builds on top of pull request 15, but since that pull request is not merged yet, the diff to master will include too much. I'll happily rebase when that is merged.