Remove unnecessary pathmap usage

speex is being removed by the pathmap because libspeexresampler already
exports that include dir automatically if you link against it.

Test: mma
Change-Id: If3d07234696cd24ff0060d829f55d9d50a3df849
diff --git a/media/libeffects/preprocessing/Android.mk b/media/libeffects/preprocessing/Android.mk
index 4e4b094..bd67aa1 100644
--- a/media/libeffects/preprocessing/Android.mk
+++ b/media/libeffects/preprocessing/Android.mk
@@ -16,8 +16,6 @@
     external/webrtc/webrtc/modules/audio_processing/include \
     $(call include-path-for, audio-effects)
 
-LOCAL_C_INCLUDES += $(call include-path-for, speex)
-
 LOCAL_SHARED_LIBRARIES := \
     libwebrtc_audio_preprocessing \
     libspeexresampler \