Rust: Add some ffi models

Author: hvitved

rust/ql/lib/codeql/rust/frameworks/stdlib/ffi.model.yml

@@ -0,0 +1,8 @@
+extensions:
+  - addsTo:
+      pack: codeql/rust-all
+      extensible: summaryModel
+    data:
+      - ["<std::ffi::os_str::OsStr>::to_str", "Argument[self].Reference.Field[std::ffi::os_str::OsStr::inner]", "ReturnValue.Field[core::option::Option::Some(0)].Reference", "taint", "manual"]
+      - ["<std::ffi::os_str::OsStr>::to_string_lossy", "Argument[self].Reference.Field[std::ffi::os_str::OsStr::inner]", "ReturnValue.Field[alloc::borrow::Cow::Owned(0)]", "taint", "manual"]
+      - ["<std::ffi::os_str::OsStr>::as_encoded_bytes", "Argument[self].Reference.Field[std::ffi::os_str::OsStr::inner]", "ReturnValue.Reference", "taint", "manual"]