Backport platform specific code to python2 (#6772)

stdlib/@python2/resource.pyi

@@ -1,46 +1,42 @@
+import sys
 from typing import NamedTuple, Tuple
 
-class error(Exception): ...
-
-RLIM_INFINITY: int
-
-def getrlimit(resource: int) -> Tuple[int, int]: ...
-def setrlimit(resource: int, limits: Tuple[int, int]) -> None: ...
-
-RLIMIT_CORE: int
-RLIMIT_CPU: int
-RLIMIT_FSIZE: int
-RLIMIT_DATA: int
-RLIMIT_STACK: int
-RLIMIT_RSS: int
-RLIMIT_NPROC: int
-RLIMIT_NOFILE: int
-RLIMIT_OFILE: int
-RLIMIT_MEMLOCK: int
-RLIMIT_VMEM: int
-RLIMIT_AS: int
-
-class _RUsage(NamedTuple):
-    ru_utime: float
-    ru_stime: float
-    ru_maxrss: int
-    ru_ixrss: int
-    ru_idrss: int
-    ru_isrss: int
-    ru_minflt: int
-    ru_majflt: int
-    ru_nswap: int
-    ru_inblock: int
-    ru_oublock: int
-    ru_msgsnd: int
-    ru_msgrcv: int
-    ru_nsignals: int
-    ru_nvcsw: int
-    ru_nivcsw: int
-
-def getrusage(who: int) -> _RUsage: ...
-def getpagesize() -> int: ...
-
-RUSAGE_SELF: int
-RUSAGE_CHILDREN: int
-RUSAGE_BOTH: int
+if sys.platform != "win32":
+    class error(Exception): ...
+    RLIM_INFINITY: int
+    def getrlimit(resource: int) -> Tuple[int, int]: ...
+    def setrlimit(resource: int, limits: Tuple[int, int]) -> None: ...
+    RLIMIT_CORE: int
+    RLIMIT_CPU: int
+    RLIMIT_FSIZE: int
+    RLIMIT_DATA: int
+    RLIMIT_STACK: int
+    RLIMIT_RSS: int
+    RLIMIT_NPROC: int
+    RLIMIT_NOFILE: int
+    RLIMIT_OFILE: int
+    RLIMIT_MEMLOCK: int
+    RLIMIT_VMEM: int
+    RLIMIT_AS: int
+    class _RUsage(NamedTuple):
+        ru_utime: float
+        ru_stime: float
+        ru_maxrss: int
+        ru_ixrss: int
+        ru_idrss: int
+        ru_isrss: int
+        ru_minflt: int
+        ru_majflt: int
+        ru_nswap: int
+        ru_inblock: int
+        ru_oublock: int
+        ru_msgsnd: int
+        ru_msgrcv: int
+        ru_nsignals: int
+        ru_nvcsw: int
+        ru_nivcsw: int
+    def getrusage(who: int) -> _RUsage: ...
+    def getpagesize() -> int: ...
+    RUSAGE_SELF: int
+    RUSAGE_CHILDREN: int
+    RUSAGE_BOTH: int