default-crate-overrides: add zstd-sys and fuser

zstd-sys: set ZSTD_SYS_USE_PKG_CONFIG so build.rs probes the system
libzstd via pkg-config instead of compiling the vendored C amalgamation
from scratch in every consumer.

fuser: with the default-on libfuse feature, build.rs discovers libfuse
via pkg-config and has no vendored fallback, so it fails in the sandbox
without pkg-config and fuse3 in scope.

pkgs/build-support/rust/default-crate-overrides.nix

@@ -15,6 +15,7 @@
   fontconfig,
   foundationdb,
   freetype,
+  fuse3,
   gdk-pixbuf,
   glib,
   gmp,
@@ -43,6 +44,7 @@
   udev,
   webkitgtk_4_1,
   zlib,
+  zstd,
   buildPackages,
   ...
 }:
@@ -146,6 +148,11 @@
     buildInputs = [ freetype ];
   };
 
+  fuser = attrs: {
+    nativeBuildInputs = [ pkg-config ];
+    buildInputs = [ fuse3 ];
+  };
+
   glib-sys = attrs: {
     nativeBuildInputs = [ pkg-config ];
     buildInputs = [ glib ];
@@ -392,6 +399,12 @@
     buildInputs = [ python3 ];
   };
 
+  zstd-sys = attrs: {
+    ZSTD_SYS_USE_PKG_CONFIG = true;
+    nativeBuildInputs = [ pkg-config ];
+    buildInputs = [ zstd ];
+  };
+
   atk-sys = attrs: {
     nativeBuildInputs = [ pkg-config ];
     buildInputs = [ atk ];