Update mac build scripts

[twangboy]

What does this PR do?

Roll back #56417
Building on 10.14 seems to fix most of the issues

What issues does this PR fix or reference?

#56417

Tests written?

NA

Commits signed with GPG?

Yes

[codecov]

Codecov Report

Merging #56435 into master will decrease coverage by 0.99%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #56435      +/-   ##
==========================================
- Coverage    18.4%   17.41%      -1%     
==========================================
  Files        1271     1234      -37     
  Lines      249324   232701   -16623     
  Branches    54383    50760    -3623     
==========================================
- Hits        45894    40528    -5366     
+ Misses     199443   189269   -10174     
+ Partials     3987     2904    -1083

Flag	Coverage Δ
#archlts	16.7% <ø> (+0.31%)	⬆️
#centos7	24.42% <ø> (-0.86%)	⬇️
#cloud	?
#proxy	24.48% <ø> (+0.03%)	⬆️
#py2	17.22% <ø> (-7.79%)	⬇️
#py3	17.08% <ø> (-1.05%)	⬇️
#runtests	17.41% <ø> (-1%)	⬇️
#ubuntu1604	24.42% <ø> (+0.02%)	⬆️
#zeromq	17.41% <ø> (+0.06%)	⬆️

Impacted Files	Coverage Δ
salt/ext/tornado/httpclient.py	22.27% <0%> (-42.36%)	⬇️
salt/ext/tornado/tcpclient.py	24.52% <0%> (-41.51%)	⬇️
salt/utils/xmlutil.py	13.63% <0%> (-40.91%)	⬇️
salt/ext/tornado/simple_httpclient.py	17.11% <0%> (-31.84%)	⬇️
salt/utils/vt.py	10.75% <0%> (-28.7%)	⬇️
salt/utils/aws.py	15.71% <0%> (-27.5%)	⬇️
salt/ext/tornado/http1connection.py	12.8% <0%> (-26.09%)	⬇️
salt/utils/cloud.py	9.31% <0%> (-23.25%)	⬇️
salt/utils/openstack/pyrax/__init__.py	55.55% <0%> (-22.23%)	⬇️
salt/cloud/__init__.py	7.77% <0%> (-20.99%)	⬇️
... and 125 more

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