兼容glibc

Change-Id: I7b1361d8f1e3c31c2d94b31b6addc32869dee457
diff --git a/mbtk/libmbtk_audio/src/mbtk_wav.c b/mbtk/libmbtk_audio/src/mbtk_wav.c
index cfe08a8..f2e104c 100755
--- a/mbtk/libmbtk_audio/src/mbtk_wav.c
+++ b/mbtk/libmbtk_audio/src/mbtk_wav.c
@@ -362,7 +362,7 @@
 
     mbtk_audio_pcm_sample_rate_set(sample_rate);
 
-    wav_recorder_fd = open(path, O_WRONLY | O_CREAT | O_TRUNC);
+    wav_recorder_fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
     if (wav_recorder_fd < 0) {
         LOGE("%s: error opening file %s!", __FUNCTION__, path);
         return -1;