Remove Formula: FFmpeg-PHP

No longer works with FFmpeg version newer than 0.8.x and upstream project has
been dead for years.

Closes Homebrew/homebrew#7780.

Formula/ffmpeg-php.rb

@@ -1,27 +0,0 @@
-require 'formula'
-
-class FfmpegPhp < Formula
-  homepage 'http://ffmpeg-php.sourceforge.net'
-  head 'http://ffmpeg-php.svn.sourceforge.net/svnroot/ffmpeg-php/trunk/ffmpeg-php'
-
-  depends_on 'ffmpeg'
-
-  def install
-    system "phpize"
-    system "./configure", "--disable-debug",
-                          "--prefix=#{prefix}",
-                          "--with-ffmpeg=#{HOMEBREW_PREFIX}"
-    system "make"
-    prefix.install 'modules/ffmpeg.so'
-  end
-
-  def caveats; <<-EOS
- * Add the following line to php.ini:
-    extension="#{prefix}/ffmpeg.so"
- * Restart your webserver.
- * Write a PHP page that calls "phpinfo();"
- * Load it in a browser and look for the info on the ffmpeg module.
- * If you see it, you have been successful!
-    EOS
-  end
-end