postgis: Rename binaries and man pages to avoid link conflicts

Formula/postgis-for-postgresql-16.rb → Formula/postgis@16.rb

@@ -3,7 +3,7 @@
 # Generated with:
 #     brew tap --force homebrew/homebrew-core
 #     brew extract homebrew/homebrew-core/postgis MercuryTechnologies/homebrew-tap
-class PostgisForPostgresql16 < Formula
+class PostgisAT16 < Formula
   desc "Adds support for geographic objects to PostgreSQL"
   homepage "https://postgis.net/"
   url "https://download.osgeo.org/postgis/source/postgis-3.4.2.tar.gz"
@@ -16,8 +16,6 @@ class PostgisForPostgresql16 < Formula
     regex(/href=.*?postgis[._-]v?(\d+(?:\.\d+)+)\.t/i)
   end
 
-  keg_only :versioned_formula
-
   head do
     url "https://git.osgeo.org/gitea/postgis/postgis.git", branch: "master"
 
@@ -44,6 +42,13 @@ def postgresql
     Formula["postgresql@16"]
   end
 
+  def add_suffix(file, suffix)
+    dir = File.dirname(file)
+    ext = File.extname(file)
+    base = File.basename(file, ext)
+    File.rename file, "#{dir}/#{base}-#{suffix}#{ext}"
+  end
+
   def install
     # Work around an Xcode 15 linker issue which causes linkage against LLVM's
     # libunwind due to it being present in a library search path.
@@ -114,6 +119,10 @@ def install
       utils/test_geography_joinestimation.pl
       utils/test_joinestimation.pl
     ]
+
+    # Handle conflicts between different PostGIS formulae.
+    bin.children.each { |file| add_suffix file, postgresql.version.major }
+    man1.children.each { |file| add_suffix file, postgresql.version.major }
   end
 
   test do