cargo: Use the library name instead of package name

The library name defaults to its package name, but it can be different.
For example:
- package name: cairo-sys-rs
- library name: cairo-sys
- dependency name: ffi

mesonbuild/cargo/interpreter.py

@@ -643,8 +643,10 @@ def _create_lib(self, pkg: PackageState, build: builder.Builder, crate_type: man
         for name in pkg.required_deps:
             dep = pkg.manifest.dependencies[name]
             dependencies.append(build.identifier(_dependency_varname(dep.package)))
-            if name != dep.package:
-                dependency_map[build.string(fixup_meson_varname(dep.package))] = build.string(name)
+            dep_pkg = self._dep_package(dep)
+            dep_lib_name = dep_pkg.manifest.lib.name
+            if name != dep_lib_name:
+                dependency_map[build.string(fixup_meson_varname(dep_lib_name))] = build.string(name)
 
         rust_args: T.List[mparser.BaseNode] = [
             build.identifier('features_args'),
@@ -654,7 +656,7 @@ def _create_lib(self, pkg: PackageState, build: builder.Builder, crate_type: man
         dependencies.append(build.identifier(_extra_deps_varname()))
 
         posargs: T.List[mparser.BaseNode] = [
-            build.string(fixup_meson_varname(pkg.manifest.package.name)),
+            build.string(fixup_meson_varname(pkg.manifest.lib.name)),
             build.string(pkg.manifest.lib.path),
         ]