add fluidsynth dependency for Windows build

README.md

@@ -105,6 +105,7 @@ that case, but I haven't tested doing it like that. Sorry. Get a better OS...)
    Purr Data. Issue the following command:<code>
 pacman -S autoconf automake git libtool \
           make mingw-w64-i686-dlfcn mingw-w64-i686-fftw \
+          mingw-w64-i686-fluidsynth \
           mingw-w64-i686-ftgl mingw-w64-i686-fribidi \
           mingw-w64-i686-ladspa-sdk mingw-w64-i686-lame \
           mingw-w64-i686-libsndfile mingw-w64-i686-libvorbis \