[gcc r15-10294] libphobos: enable for sparc64-unknown-linux-gnu

[Sam James]

https://gcc.gnu.org/g:d9fbf1d2de56009aca112596ee68b4938e145d0a

commit r15-10294-gd9fbf1d2de56009aca112596ee68b4938e145d0a
Author: Sam James <sam@gentoo.org>
Date:   Sun Apr 20 01:43:39 2025 +0100

    libphobos: enable for sparc64-unknown-linux-gnu
    
    This bootstraps with some test failures but works well enough to build
    11..15.
    
    libphobos/ChangeLog:
    
            * configure.tgt: Add sparc64-unknown-linux-gnu as a supported target.
    
    (cherry picked from commit 2572d46f0d1e426c1091f9b84861ee5213b84b5a)

Diff:
---
 libphobos/configure.tgt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libphobos/configure.tgt b/libphobos/configure.tgt
index ae3b2c20ea7c..456b4d5b96d6 100644
--- a/libphobos/configure.tgt
+++ b/libphobos/configure.tgt
@@ -67,7 +67,7 @@ case "${target}" in
   s390*-linux*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;
-  sparc*-*-solaris2.11*)
+  sparc64-*-linux* | sparc*-*-solaris2.11*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;
   *-*-darwin9* | *-*-darwin1[01]*)