added extern "C" protect for speex_stereo.h, bug submitted back to author

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6216 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/media/plugins/speex/libspeex/speex_stereo.h

@@ -37,6 +37,10 @@
 
 #include "speex_bits.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** State used for decoding (intensity) stereo information */
 typedef struct SpeexStereoState {
    float balance;      /**< Left/right balance info */
@@ -59,4 +63,8 @@ void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *stereo);
 /** Callback handler for intensity stereo info */
 int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif