Fix lastfmfpclient compilation with clang

NOTE lastfm_fplib is the exact same formula! We need to solve deletion/renames and remove one of them.

Fixes Homebrew/homebrew#13485.

Formula/lastfm_fplib.rb

@@ -11,6 +11,7 @@ class LastfmFplib < Formula
   depends_on 'fftw'
 
   def install
+    Formula.factory("lastfmfpclient").inreplace_fix
     system "cmake", ".", *std_cmake_args
     system "make install"
   end

Formula/lastfmfpclient.rb

@@ -12,7 +12,18 @@ class Lastfmfpclient < Formula
   depends_on 'mad'
   depends_on 'libsamplerate'
 
+  def inreplace_fix
+    # This project was made on Windows (LOL), patches against Windows
+    # line-endings fail for some reason, so we will inreplace instead.
+    # Fixes compile with clang failure due to entirely missing variable, how
+    # the fuck did GCC ever compile this?!
+    inreplace 'fplib/src/FloatingAverage.h',
+      'for ( int i = 0; i < size; ++i )',
+      'for ( int i = 0; i < m_values.size(); ++i )'
+  end
+
   def install
+    inreplace_fix
     system "cmake", ".", *std_cmake_args
     system "make install"
   end