Re-enable buffer ctypedef error message (disabled for fused declarations)

Cython/Compiler/Symtab.py

@@ -366,7 +366,7 @@ class Scope(object):
         # Create new entry, and add to dictionary if
         # name is not None. Reports a warning if already
         # declared.
-        if type.is_buffer and not isinstance(self, LocalScope) and not is_type:
+        if type.is_buffer and not isinstance(self, LocalScope): # and not is_type:
             error(pos, 'Buffer types only allowed as function local variables')
         if not self.in_cinclude and cname and re.match("^_[_A-Z]+$", cname):
             # See http://www.gnu.org/software/libc/manual/html_node/Reserved-Names.html#Reserved-Names