libpng@1.2: remove

Aliases/libpng@1.6

@@ -1 +0,0 @@
-../Formula/libpng.rb

Formula/libpng@1.2.rb

@@ -1,42 +0,0 @@
-class LibpngAT12 < Formula
-  desc "Library for manipulating PNG images"
-  homepage "http://www.libpng.org/pub/png/libpng.html"
-  url "https://downloads.sourceforge.net/project/libpng/libpng12/older-releases/1.2.54/libpng-1.2.54.tar.xz"
-  mirror "https://dl.bintray.com/homebrew/mirror/libpng-1.2.54.tar.xz"
-  sha256 "cf85516482780f2bc2c5b5073902f12b1519019d47bf473326c2018bdff1d272"
-
-  bottle do
-    cellar :any
-    sha256 "2e896eb5f32858eb578e89dd688260bb63da45760581acc01d342876eaced246" => :high_sierra
-    sha256 "0f85343171350540afdbea7912b1c3873be2674c20939cb9586f549df0b0ac7b" => :sierra
-    sha256 "3a77919fd1e4776d87df3838dfffb1e6588cd71798424cf809ccebd284bc2f08" => :el_capitan
-    sha256 "65c40b981d5fb639087ebabca450d1a70596049bc45dbfbbec3e7e93a31454c4" => :yosemite
-  end
-
-  keg_only :versioned_formula
-
-  def install
-    system "./configure", "--disable-dependency-tracking",
-                          "--disable-silent-rules",
-                          "--prefix=#{prefix}"
-    system "make"
-    system "make", "test"
-    system "make", "install"
-  end
-
-  test do
-    (testpath/"test.c").write <<~EOS
-      #include <png.h>
-
-      int main()
-      {
-        png_structp png_ptr;
-        png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
-        return 0;
-      }
-    EOS
-    system ENV.cc, "test.c", "-I#{include}", "-L#{lib}", "-lpng", "-o", "test"
-    system "./test"
-  end
-end