Fix stubtest issues (#5360)

* Fix some stubtest issues

* Remove MADV_SOFT_OFFLINE

stdlib/mmap.pyi

@@ -82,26 +82,37 @@ else:
         def __delitem__(self, index: Union[int, slice]) -> None: ...
         def __setitem__(self, index: Union[int, slice], object: bytes) -> None: ...
 
-if sys.version_info >= (3, 8):
+if sys.version_info >= (3, 8) and sys.platform != "win32":
     MADV_NORMAL: int
     MADV_RANDOM: int
     MADV_SEQUENTIAL: int
     MADV_WILLNEED: int
     MADV_DONTNEED: int
-    MADV_REMOVE: int
-    MADV_DONTFORK: int
-    MADV_DOFORK: int
-    MADV_HWPOISON: int
-    MADV_MERGEABLE: int
-    MADV_UNMERGEABLE: int
-    MADV_SOFT_OFFLINE: int
-    MADV_HUGEPAGE: int
-    MADV_NOHUGEPAGE: int
-    MADV_DONTDUMP: int
-    MADV_DODUMP: int
-    MADV_FREE: int
-    MADV_NOSYNC: int
-    MADV_AUTOSYNC: int
-    MADV_NOCORE: int
-    MADV_CORE: int
-    MADV_PROTECT: int
+
+    if sys.platform == "linux":
+        MADV_REMOVE: int
+        MADV_DONTFORK: int
+        MADV_DOFORK: int
+        MADV_HWPOISON: int
+        MADV_MERGEABLE: int
+        MADV_UNMERGEABLE: int
+        # Seems like this constant is not defined in glibc.
+        # See https://github.com/python/typeshed/pull/5360 for details
+        # MADV_SOFT_OFFLINE: int
+        MADV_HUGEPAGE: int
+        MADV_NOHUGEPAGE: int
+        MADV_DONTDUMP: int
+        MADV_DODUMP: int
+        MADV_FREE: int
+
+    # This Values are defined for FreeBSD but type checkers do not support conditions for these
+    if sys.platform != "linux" and sys.platform != "darwin":
+        MADV_NOSYNC: int
+        MADV_AUTOSYNC: int
+        MADV_NOCORE: int
+        MADV_CORE: int
+        MADV_PROTECT: int
+
+if sys.version_info >= (3, 10) and sys.platform == "darwin":
+    MADV_FREE_REUSABLE: int
+    MADV_FREE_REUSE: int

stdlib/urllib/request.pyi

@@ -97,7 +97,6 @@ class BaseHandler:
     parent: OpenerDirector
     def add_parent(self, parent: OpenerDirector) -> None: ...
     def close(self) -> None: ...
-    def http_error_nnn(self, req: Request, fp: IO[str], code: int, msg: int, headers: Mapping[str, str]) -> _UrlopenRet: ...
 
 class HTTPDefaultErrorHandler(BaseHandler):
     def http_error_default(

stdlib/urllib/robotparser.pyi

@@ -10,7 +10,7 @@ class RobotFileParser:
     def set_url(self, url: str) -> None: ...
     def read(self) -> None: ...
     def parse(self, lines: Iterable[str]) -> None: ...
-    def can_fetch(self, user_agent: str, url: str) -> bool: ...
+    def can_fetch(self, useragent: str, url: str) -> bool: ...
     def mtime(self) -> int: ...
     def modified(self) -> None: ...
     def crawl_delay(self, useragent: str) -> Optional[str]: ...

stdlib/webbrowser.pyi

@@ -48,7 +48,6 @@ class UnixBrowser(BaseBrowser):
     def open(self, url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
 
 class Mozilla(UnixBrowser):
-    raise_opts: List[str]
     remote_args: List[str]
     remote_action: str
     remote_action_newwin: str