rust-filepatterns: also normalize RelPath

These patterns should be normalized too; this at least does no harm,
and is necessary for proper status support.

rust/hg-core/src/filepatterns.rs

@@ -317,6 +317,7 b' pub fn build_single_regex('
         PatternSyntax::RootGlob
         | PatternSyntax::Path
         | PatternSyntax::RelGlob
+        | PatternSyntax::RelPath
         | PatternSyntax::RootFiles => normalize_path_bytes(pattern),
         PatternSyntax::Include | PatternSyntax::SubInclude => {
             return Err(PatternError::NonRegexPattern(entry.clone()))