update ms2 to fix compilation issue on resampler

diff --git a/mediastreamer2 b/mediastreamer2
index 1900aea420f2b9bb66690eeecd75b28750a6d83e..59ca56e59d0409e930cb3fdfa98e9970bdf9ac4d 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 1900aea420f2b9bb66690eeecd75b28750a6d83e
+Subproject commit 59ca56e59d0409e930cb3fdfa98e9970bdf9ac4d