elf/section: Remove __hash__ (#659)

self.header: Container is not hashable as it is modifiable.
Remove __hash__() from Section.

Closes: #539

Signed-off-by: Philipp Hahn <phahn-oss@avm.de>

Author: pmhahn

elftools/elf/sections.py

@@ -134,9 +134,6 @@ def __getitem__(self, name: str) -> Any:
     def __eq__(self, other: object) -> bool:
         return isinstance(other, Section) and self.header == other.header
 
-    def __hash__(self) -> int:
-        return hash(self.header)
-
 
 class NullSection(Section):
     """ ELF NULL section