Fix unsound implementation of ImageSurfaceDataExt

This prevents you from making unaligned accesses to arbitrary `[u8]`,
restricting the pointer-casting shenanigans to only the spots where
the data type can justify them.

Fixes #450

Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/664>

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 236fc41d..74def2da 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -863,6 +863,7 @@ name = "librsvg"
 version = "2.53.1"
 dependencies = [
  "assert_cmd",
+ "byteorder",
  "cairo-rs",
  "cast 0.3.0",
  "chrono",