appveyor: FSP_FSCTL_VOLUME_PARAMS size change compat testing

tst/compat/README.md

@@ -0,0 +1,4 @@
+This directory contains binaries for backwards compatibility testing.
+
+- `v1.1/passthrough-fuse`: testing of changes related to `struct fuse_stat_ex` (`v1.2B3`)
+- `v1.2/memfs`: testing of `FSP_FSCTL_VOLUME_PARAMS` size change (`v1.3B3`)

tst/compat/v1.1/passthrough-fuse/README.md

@@ -1,3 +0,0 @@
-This directory contains binaries of `passthrough-fuse` from release `v1.2B2`. Both `x64` and `x86` binaries are provided.
-
-The WinFsp-FUSE layer added support for `struct fuse_stat_ex` in `v1.2B3` which was a potentially breaking change for backwards compatibility. These binaries are used to verify that WinFsp-FUSE remains backwards compatible.