[binutils-gdb] Remove unused str_backtrace_unavailable variable

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=8e77de4747e909527cd62d807bc2686ea0f63be3

commit 8e77de4747e909527cd62d807bc2686ea0f63be3
Author: Luis Machado <[email protected]>
Date:   Fri May 1 02:31:17 2026 -0500

    Remove unused str_backtrace_unavailable variable
    
    The str_backtrace_unavailable variable is initialized but never
    used anywhere in the codebase.
    
    Approved-By: Tom Tromey <[email protected]>

Diff:
---
 gdb/bt-utils.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/gdb/bt-utils.c b/gdb/bt-utils.c
index 7fc8d04f306..21a291c3df3 100644
--- a/gdb/bt-utils.c
+++ b/gdb/bt-utils.c
@@ -146,7 +146,6 @@ gdb_internal_backtrace_1 ()
 #endif
 
 static const char *str_backtrace = "----- Backtrace -----\n";
-static const char *str_backtrace_unavailable = "Backtrace unavailable\n";
 
 #endif /* GDB_PRINT_INTERNAL_BACKTRACE */
 
@@ -157,7 +156,6 @@ gdb_internal_backtrace_init_str ()
 {
 #ifdef GDB_PRINT_INTERNAL_BACKTRACE
   str_backtrace = _("----- Backtrace -----\n");
-  str_backtrace_unavailable = _("Backtrace unavailable\n");
 #endif
 }