Loosen the generic bound on impl IntoIterator for &SymbolTable

All of these existing `IntoIterator` impls did not include the generic
parameter for the `BuildHasher`, meaning the impl was overly (and
unnecessarily) restrictive.

Found by `clippy::iter_without_into_iter`. See rust-lang/rust-clippy#11692 (comment).

src/bytes.rs

@@ -268,7 +268,7 @@ impl<'a> Iterator for Iter<'a> {
 
 impl<'a> FusedIterator for Iter<'a> {}
 
-impl<'a> IntoIterator for &'a SymbolTable {
+impl<'a, S> IntoIterator for &'a SymbolTable<S> {
     type Item = (Symbol, &'a [u8]);
     type IntoIter = Iter<'a>;
 

src/cstr.rs

@@ -277,7 +277,7 @@ impl<'a> Iterator for Iter<'a> {
 
 impl<'a> FusedIterator for Iter<'a> {}
 
-impl<'a> IntoIterator for &'a SymbolTable {
+impl<'a, S> IntoIterator for &'a SymbolTable<S> {
     type Item = (Symbol, &'a CStr);
     type IntoIter = Iter<'a>;
 

src/osstr.rs

@@ -277,7 +277,7 @@ impl<'a> Iterator for Iter<'a> {
 
 impl<'a> FusedIterator for Iter<'a> {}
 
-impl<'a> IntoIterator for &'a SymbolTable {
+impl<'a, S> IntoIterator for &'a SymbolTable<S> {
     type Item = (Symbol, &'a OsStr);
     type IntoIter = Iter<'a>;
 

src/path.rs

@@ -277,7 +277,7 @@ impl<'a> Iterator for Iter<'a> {
 
 impl<'a> FusedIterator for Iter<'a> {}
 
-impl<'a> IntoIterator for &'a SymbolTable {
+impl<'a, S> IntoIterator for &'a SymbolTable<S> {
     type Item = (Symbol, &'a Path);
     type IntoIter = Iter<'a>;
 

src/str.rs

@@ -214,7 +214,7 @@ impl<'a> Iterator for Iter<'a> {
 
 impl<'a> FusedIterator for Iter<'a> {}
 
-impl<'a> IntoIterator for &'a SymbolTable {
+impl<'a, S> IntoIterator for &'a SymbolTable<S> {
     type Item = (Symbol, &'a str);
     type IntoIter = Iter<'a>;