cmd/snap-confine: genearlize apparmor profile for various lib layout

[zyga]

Depending on the distribution at hand we the conceptual "/lib" may be
at /lib or /usr/lib, the "lib" directory may be spelled
lib, lib32, lib64 or even libx32. It may be optionally followed by a
multiarch suffix. This patch applies those rules to all the shared
libraries we need to map and read.

Signed-off-by: Zygmunt Krynicki me@zygoon.pl

[jdstrand]

You dropped libdl.

[zyga]

Corrected

[jdstrand]

Assuming the testsuite passes, approving.

[codecov-io]

Codecov Report

Merging #3789 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3789      +/-   ##
==========================================
- Coverage   75.81%   75.81%   -0.01%     
==========================================
  Files         402      402              
  Lines       34741    34745       +4     
==========================================
+ Hits        26340    26341       +1     
- Misses       6527     6529       +2     
- Partials     1874     1875       +1

Impacted Files	Coverage Δ
corecfg/powerbtn.go	70.73% <0%> (-4.95%)	⬇️
interfaces/builtin/core_support.go	100% <0%> (ø)	⬆️

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