android: Pull known good toolchain versions

This includes pulling libSPIRV-Tools-opt into the build
to satisfy new shaderc revision.
diff --git a/build-android/shaderc_revision_android b/build-android/shaderc_revision_android
index 0c161a0..1f7391f 100644
--- a/build-android/shaderc_revision_android
+++ b/build-android/shaderc_revision_android
@@ -1 +1 @@
-c63df792b2d535734cd0d1e6111de7ca29dcb555
+master