Disable satisfied-skip-solve on 32-bit linux

[angusmoore]

Motivation: The default install of Conda on 32 bit linux uses pre-built binaries from repo.anaconda.com/miniconda; the 32 bit linux builds are very dated and do not support the --satisfied-skip-solve flag.

Change: Ignore / disable satisfied_skip_solve on 32 bit linux, in the same way it is ignored on windows (and add a linux-specific warning if it is set to true, as is the case in windows).

Detail:

The latest 32 bit linux build (https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86.sh) is 4.5.12, which pre-dates the introduction of --satisfied-skip-solve, which was introduced in 4.6.0 (https://docs.conda.io/projects/conda/en/latest/release-notes.html\#version-4.6.0).

This is a somewhat draconian approach, as someone could have a newer build of Conda on a 32 bit linux system (installed by some other means than the default Conda installer), and this change prevents them from using --satisfied-skip-solve.

Even so, I think this change is worthwhile because (a) the current state means a default install of PyCall (which sets this flag) on 32 bit linux fails (b) preventing --satisfied-skip-solve does not change correctness, just performance (I believe, I'm not an expert on conda) (c) there are probably not a lot of people hitting this code path (on 32 bit linux, with their own, newer, Conda).

An alternative would be to explicitly check the Conda version and if it is <4.6.0 , ignore satisfied_skip_solve. However, that seemed far more complex / a lot of extra code for little gain (again, given there isn't much cost to disabling satisfied-skip-solve for a likely small share of workflows)

Reference: #245 and github.com/JuliaPy/PyCall.jl/pull/1045

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.22%. Comparing base (f1f4760) to head (899db5b).

Files with missing lines	Patch %	Lines
src/Conda.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #268   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files           1        1           
  Lines         203      203           
=======================================
  Hits          173      173           
  Misses         30       30           

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