[glibc] Make elf.h header self contained.

[glibc] Make elf.h header self contained.

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9538f6b95a3be228edc078ce58258f0574142e0c

commit 9538f6b95a3be228edc078ce58258f0574142e0c
Author: Érico Rolim <ericonr@disroot.org>
Date:   Tue Oct 27 11:17:41 2020 -0300

    Make elf.h header self contained.
    
    The elf/elf.h header is shared, verbatim, by the elfutils project.
    However, elfutils can be used on systems with libcs other than glibc,
    making the presence of __BEGIN_DECLS, __END_DECLS and <features.h> in
    the file something that downstream distros may have to add patches for.
    
    Furthermore, this file doesn't declare anything with language linkage,
    so `extern "C" {}` blocks aren't necessary; it also doesn't have any
    conditional definitions based on feature test macros, making inclusion
    of features.h unnecessary.

Diff:
---
 elf/elf.h | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/elf/elf.h b/elf/elf.h
index ff9f1dadd5..6439c1a4d5 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -19,10 +19,6 @@
 #ifndef _ELF_H
 #define	_ELF_H 1
 
-#include <features.h>
-
-__BEGIN_DECLS
-
 /* Standard ELF types.  */
 
 #include <stdint.h>
@@ -4105,6 +4101,4 @@ enum
 #define R_ARC_TLS_LE_S9		0x4a
 #define R_ARC_TLS_LE_32		0x4b
 
-__END_DECLS
-
 #endif	/* elf.h */