Make the build work with speech-dispatcher >= 0.8.

third_party/speech-dispatcher/README.chromium

Index: third_party/speech-dispatcher/README.chromium
diff --git a/third_party/speech-dispatcher/README.chromium b/third_party/speech-dispatcher/README.chromium
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+Name: Speech Dispatcher
+URL: http://devel.freebsoft.org/speechd
+Version: 0.7.1
+License: GPL (v2 or later)
+Security Critical: yes
+
+Description:
+Speech Dispatcher project provides a high-level device independent layer for
+access to speech synthesis through a simple, stable and well documented
+interface.
+
+Local Modifications:
+No modifications.
+Only the libspeechd.h file is imported, as the client library (libspeechd.so.2)
+is dynamically loaded (where present).
+
+This header is imported because later versions of Speech Dispatcher (>= 0.8)
+install it into a different location (${includedir}/speech-dispatcher instead
+of ${includedir}) and we still need to support older versions.