Do not build wasapi into SDL2.

This is because, at least on wine, playback of audio via wasapi
doesn't work. The directsound path that had been used works
fine, so we go back to it.

tasks/sdl2.py

@@ -21,6 +21,6 @@ def build(c):
     c.var("version", version)
     c.chdir("SDL2-{{version}}")
 
-    c.run("""./configure {{ cross_config }} --disable-shared --disable-dependency-tracking --prefix="{{ install }}" """)
+    c.run("""./configure {{ cross_config }} --disable-shared --disable-dependency-tracking --disable-wasapi --prefix="{{ install }}" """)
     c.run("""{{ make }}""")
     c.run("""make install""")