[glibc] Linux: Forward declaration of struct iovec for process_madvise

[Florian Weimer <fw@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ecd0fbebc0ce2818ac87ca1ed2ce46a733e8c839

commit ecd0fbebc0ce2818ac87ca1ed2ce46a733e8c839
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 29 13:50:50 2022 +0200

    Linux: Forward declaration of struct iovec for process_madvise
    
    This maintains compatibility between <sys/mman.h> and <linux/uio.h>.
    Before that, the addition of process_madvise made those two header
    files incompatible.  This has been observed resulting in a build
    failure in LLDB's Process/Linux/NativeRegisterContextLinux_s390x.cpp
    source file.
    
    Fixes commit d19ee3473d68ca0e794f3a8b7677a0983ae1342e
    ("linux: Add process_madvise").
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 sysdeps/unix/sysv/linux/bits/mman_ext.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/bits/mman_ext.h b/sysdeps/unix/sysv/linux/bits/mman_ext.h
index 97234a7adf..5612852e64 100644
--- a/sysdeps/unix/sysv/linux/bits/mman_ext.h
+++ b/sysdeps/unix/sysv/linux/bits/mman_ext.h
@@ -21,11 +21,8 @@
 #endif
 
 #ifdef __USE_GNU
-#include <bits/types/struct_iovec.h>
-
-/*
- */
-extern __ssize_t process_madvise (int __pid_fd, const struct iovec* __iov,
+struct iovec;
+extern __ssize_t process_madvise (int __pid_fd, const struct iovec *__iov,
 				  size_t __count, int __advice,
 				  unsigned __flags)
   __THROW;