Build native extensions on M1

[bbuchalter]

We already support disabling this compilation flag anyway, so might as well just do it automatically for architectures that don't support it.

[bbuchalter]

Hello, just a friendly poke.

Based on https://github.com/sass/sassc-ruby/graphs/contributors perhaps @bolandrm or @eregon could help?

[bbuchalter]

Friendly ping here. 👋

[bbuchalter]

Maybe @glebm or @edward could help?

[eregon]

The default is already false, why is this change needed?

[bbuchalter]

Upon further investigation, this issue only exists in versions prior to v2.3.0. It's not clear which commit fixes it, but this does address this error:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/brian.buchalter/.gem/ruby/2.7.4/gems/sassc-2.2.1/ext
/Users/brian.buchalter/.rubies/ruby-2.7.4/bin/ruby -I /Users/brian.buchalter/.rubies/ruby-2.7.4/lib/ruby/2.7.0 -r ./siteconf20210720-81997-w05u9w.rb extconf.rb
creating Makefile

current directory: /Users/brian.buchalter/.gem/ruby/2.7.4/gems/sassc-2.2.1/ext
make "DESTDIR=" clean

current directory: /Users/brian.buchalter/.gem/ruby/2.7.4/gems/sassc-2.2.1/ext
make "DESTDIR="
compiling ./libsass/src/units.cpp
clang: error: the clang compiler does not support '-march=native'
make: *** [units.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/brian.buchalter/.gem/ruby/2.7.4/gems/sassc-2.2.1 for inspection.
Results logged to /Users/brian.buchalter/.gem/ruby/2.7.4/extensions/arm64-darwin-20/2.7.0-static/sassc-2.2.1/gem_make.out

An error occurred while installing sassc (2.2.1), and Bundler cannot continue.
Make sure that `gem install sassc -v '2.2.1'` succeeds before bundling.

[bbuchalter]

Per your comment, it was probably #158