auditbeat: migrate to python@3.9

[fxcoudert]

As part of the Python 3.9 migration (#62201).

This formula is independent from the all other Python formulas (if I didn't screw up my script or my logic)

Do not merge before the next Brew tag ships, expected on Monday 2020-10-12

[fxcoudert]

    The headers or library files could not be found for zlib,
    a required dependency when compiling Pillow from source.
    
    Please see the install instructions at:
       https://pillow.readthedocs.io/en/latest/installation.html

[yous]

Could you try this:

diff --git a/Formula/auditbeat.rb b/Formula/auditbeat.rb
index f54e3cfad6..c0d234057f 100644
--- a/Formula/auditbeat.rb
+++ b/Formula/auditbeat.rb
@@ -15,8 +15,10 @@ class Auditbeat < Formula
     sha256 "484ef0e1fab73cf7431f2867e1a4e69d055eb71855d0748ea31c27dfab401eab" => :high_sierra
   end
 
+  depends_on "freetype" => :build
   depends_on "go" => :build
   depends_on "python@3.9" => :build
+  depends_on "zlib" => :build
 
   resource "virtualenv" do
     url "https://files.pythonhosted.org/packages/d4/0c/9840c08189e030873387a73b90ada981885010dd9aea134d6de30cd24cb8/virtualenv-15.1.0.tar.gz"
@@ -55,7 +57,7 @@ class Auditbeat < Formula
 
       system "make", "mage"
       # prevent downloading binary wheels during python setup
-      system "make", "PIP_INSTALL_PARAMS=--no-binary :all", "python-env"
+      system "make", "PIP_INSTALL_PARAMS=--use-pep517 --no-binary :all:", "python-env"
       system "mage", "-v", "build"
       system "mage", "-v", "update"
 

--no-binary :all actually means nothing as the argument should be :all:. It fails even though, and --use-pep517 is needed.

• https://pip.pypa.io/en/stable/reference/pip_install/#cmdoption-no-binary

[fxcoudert]

Superseded by #63381