Allow liftime bounds on generic bounds

While liftime bounds require bindings users to ensure liftime
requirements are met, they're important for allowing us to export
lock wrappers. Thus, we relax the simple-bounds assertions checks
here.

Author: TheBlueMatt

c-bindings-gen/src/types.rs

@@ -147,7 +147,7 @@ pub fn export_status(attrs: &[syn::Attribute]) -> ExportStatus {
 }
 
 pub fn assert_simple_bound(bound: &syn::TraitBound) {
-	if bound.paren_token.is_some() || bound.lifetimes.is_some() { unimplemented!(); }
+	if bound.paren_token.is_some() { unimplemented!(); }
 	if let syn::TraitBoundModifier::Maybe(_) = bound.modifier { unimplemented!(); }
 }