update submodules

diff --git a/pico/cd/libchdr b/pico/cd/libchdr
index a03e693..a20e04c 160000 (submodule)
--- a/pico/cd/libchdr
+++ b/pico/cd/libchdr
@@ -1 +1 @@
-Subproject commit a03e69319164f69d781ab8e453f8cf407387bd13
+Subproject commit a20e04c12c0c20048bf771da6df7aa2e51f5e0cb

diff --git a/pico/sound/emu2413 b/pico/sound/emu2413
index 4062e93..a2dfc20 160000 (submodule)
--- a/pico/sound/emu2413
+++ b/pico/sound/emu2413
@@ -1 +1 @@
-Subproject commit 4062e93e9316ee5c488167ade5a83753e5f07ae3
+Subproject commit a2dfc20ff507e4fd075cd325620bcea655e2c1f7

diff --git a/platform/common/dr_libs b/platform/common/dr_libs
index 1e42667..dd762b8 160000 (submodule)
--- a/platform/common/dr_libs
+++ b/platform/common/dr_libs
@@ -1 +1 @@
-Subproject commit 1e42667b0912437d1c101a59ee9d0225ba0dffb5
+Subproject commit dd762b861ecadf5ddd5fb03e9ca1db6707b54fbb