Change from RGBA to BGRA; slightly more Intel GPU-friendly, and Caspar uses that...

[nageru] / bmusb

diff --git a/bmusb b/bmusb
index 824260a0732a49b5a18f2e16e04b0373c37a3bea..c245ceb9081e412bb815480481670e295ddfc71a 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit 824260a0732a49b5a18f2e16e04b0373c37a3bea
+Subproject commit c245ceb9081e412bb815480481670e295ddfc71a