Enable clone3() syscall on SPARC which was added in Linux v7.0

Author: glaubitz

libc-test/build.rs

@@ -3161,8 +3161,7 @@ fn test_linux(target: &str) {
             "SYS_pidfd_open" if mips => true,
 
             // FIXME: Not currently available in headers on MIPS
-            // Not yet implemented on sparc64
-            "SYS_clone3" if mips | sparc64 => true,
+            "SYS_clone3" if mips => true,
 
             // FIXME: these syscalls were added in Linux 5.9 or later
             // and are currently not included in the glibc headers.

src/unix/linux_like/linux/gnu/b32/sparc/mod.rs

@@ -836,7 +836,6 @@ pub const SYS_fsconfig: ::c_long = 431;
 pub const SYS_fsmount: ::c_long = 432;
 pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
-// Reserved in the kernel, but not actually implemented yet
 pub const SYS_clone3: ::c_long = 435;
 pub const SYS_close_range: ::c_long = 436;
 pub const SYS_openat2: ::c_long = 437;

src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs

@@ -896,7 +896,6 @@ pub const SYS_fsconfig: ::c_long = 431;
 pub const SYS_fsmount: ::c_long = 432;
 pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
-// Reserved in the kernel, but not actually implemented yet
 pub const SYS_clone3: ::c_long = 435;
 pub const SYS_close_range: ::c_long = 436;
 pub const SYS_openat2: ::c_long = 437;