[glibc] aarch64: fix static PIE start code for BTI [BZ #27068]

[Szabolcs Nagy]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d4136903a29baabeec8987b53081def8b4a49826

commit d4136903a29baabeec8987b53081def8b4a49826
Author: Guillaume Gardet <guillaume.gardet@arm.com>
Date:   Mon Dec 14 15:38:22 2020 +0000

    aarch64: fix static PIE start code for BTI [BZ #27068]
    
    A bti c was missing from rcrt1.o which made all -static-pie
    binaries fail at program startup on BTI enabled systems.
    
    Fixes bug 27068.

Diff:
---
 sysdeps/aarch64/start.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sysdeps/aarch64/start.S b/sysdeps/aarch64/start.S
index 108f602721..1998ea95d4 100644
--- a/sysdeps/aarch64/start.S
+++ b/sysdeps/aarch64/start.S
@@ -99,6 +99,7 @@ ENTRY(_start)
 	   because crt1.o and rcrt1.o share code and the later must avoid the
 	   use of GOT relocations before __libc_start_main is called.  */
 __wrap_main:
+	BTI_C
 	b	main
 #endif
 END(_start)