globset: use bstr

This simplifies the various path related functions and pushed more platform
dependent code down into bstr. This likely also makes things a bit more
efficient on Windows, since we now only do a single UTF-8 check for each
file path.

globset/src/glob.rs

@@ -120,7 +120,7 @@ impl GlobMatcher {
 
     /// Tests whether the given path matches this pattern or not.
     pub fn is_match_candidate(&self, path: &Candidate) -> bool {
-        self.re.is_match(&path.path)
+        self.re.is_match(path.path.as_bytes())
     }
 }
 
@@ -145,7 +145,7 @@ impl GlobStrategic {
 
     /// Tests whether the given path matches this pattern or not.
     fn is_match_candidate(&self, candidate: &Candidate) -> bool {
-        let byte_path = &*candidate.path;
+        let byte_path = candidate.path.as_bytes();
 
         match self.strategy {
             MatchStrategy::Literal(ref lit) => lit.as_bytes() == byte_path,