bzip3 1.2.1 (new formula)

* bzip3 1.2.1 (new formula)
* bzip3: add comment about libtool patch

Closes #120028.

Co-authored-by: Rui Chen <rui@chenrui.dev>
Signed-off-by: BrewTestBot <1589480+BrewTestBot@users.noreply.github.com>

Formula/bzip3.rb

@@ -0,0 +1,32 @@
+class Bzip3 < Formula
+  desc "Better and stronger spiritual successor to BZip2"
+  homepage "https://github.com/kspalaiologos/bzip3"
+  url "https://github.com/kspalaiologos/bzip3/releases/download/1.2.1/bzip3-1.2.1.tar.gz"
+  sha256 "bba90d867f53efa4291de1df9c22da1578e1a93ca819e0fc68881da6fcc4149d"
+  license "LGPL-3.0-only"
+
+  # Fix -flat_namespace being used on Big Sur and later.
+  # upstream patch commit, https://github.com/kspalaiologos/bzip3/commit/e667cacfaa0b4b56e45d48e0496041c376c82d53
+  # remove in next release
+  patch do
+    url "https://raw.githubusercontent.com/Homebrew/formula-patches/03cf8088210822aa2c1ab544ed58ea04c897d9c4/libtool/configure-big_sur.diff"
+    sha256 "35acd6aebc19843f1a2b3a63e880baceb0f5278ab1ace661e57a502d9d78c93c"
+  end
+
+  def install
+    system "./configure", *std_configure_args, "--disable-silent-rules", "--disable-arch-native"
+    system "make", "install"
+  end
+
+  test do
+    testfilepath = testpath + "sample_in.txt"
+    zipfilepath = testpath + "sample_in.txt.bz3"
+
+    testfilepath.write "TEST CONTENT"
+
+    system bin/"bzip3", testfilepath
+    system bin/"bunzip3", "-f", zipfilepath
+
+    assert_equal "TEST CONTENT", testfilepath.read
+  end
+end