Drop looking for voices in /usr/share/mbrola/voices: our Debian packages
never put voices there, and letting espeak look there would show a
warning to the user that suggests that voices should be put there, which
is not the case in Debian.

--- a/src/libespeak-ng/synth_mbrola.c
+++ b/src/libespeak-ng/synth_mbrola.c
@@ -86,8 +86,10 @@ espeak_ng_STATUS LoadMbrolaTable(const c
 		if (GetFileLength(path) <= 0) {
 			sprintf(path, "/usr/share/mbrola/%s/%s", mbrola_voice, mbrola_voice);
 
+#if 0
 			if (GetFileLength(path) <= 0)
 				sprintf(path, "/usr/share/mbrola/voices/%s", mbrola_voice);
+#endif
 		}
 	}
 	close_MBR();