Win32: no portaudio and no SDL in default configure

Why so? Because, while SDL video could be useful, SDL_audio and
portaudio don't bring anything to the table, so far...

extras/package/win32/configure-common.sh

@@ -22,8 +22,8 @@
       --enable-shout \
       --enable-goom \
       --enable-caca \
-      --enable-portaudio \
-      --enable-sdl \
+      --disable-portaudio \
+      --disable-sdl \
       --enable-qt4 \
       --enable-sse --enable-mmx \
       --enable-libcddb \