unix/linux: update to glibc 2.36

Support for LoongArch has been merged upstream. This allows to
drop the loong64 specific glibc patches.

Because the header file sys/mount.h of glibc 2.36 includes fcntl.h
(commit 78a408ee7ba041fc8d5dbd5f67065b4a982c11e5), this will leads to
duplicate definition of structure stat on MIPS64.  In order to solve
this error, use the custom type my_stat to generate the Go Stat_t.

Change-Id: I888280d777d1c7089548acf1b3821762011d79b0
Reviewed-on: https://go-review.googlesource.com/c/sys/+/453555
Reviewed-by: xiaodong liu <teaofmoli@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

unix/zerrors_linux.go

@@ -1814,6 +1814,7 @@ const (
 	MADV_DONTDUMP                               = 0x10
 	MADV_DONTFORK                               = 0xa
 	MADV_DONTNEED                               = 0x4
+	MADV_DONTNEED_LOCKED                        = 0x18
 	MADV_FREE                                   = 0x8
 	MADV_HUGEPAGE                               = 0xe
 	MADV_HWPOISON                               = 0x64