splice() &Co are defined since linux 2.6.17 (glibc 2.5).
Assume it is always present.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---
 linux-user/syscall.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 064bc604c9..87f9c22b68 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -13624,15 +13624,9 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
         return ret;
 #endif
 
-#ifdef CONFIG_SPLICE
-#ifdef TARGET_NR_tee
     case TARGET_NR_tee:
-        {
-            ret = get_errno(tee(arg1,arg2,arg3,arg4));
-        }
+        ret = get_errno(tee(arg1, arg2, arg3, arg4));
         return ret;
-#endif
-#ifdef TARGET_NR_splice
     case TARGET_NR_splice:
         {
             loff_t loff_in, loff_out;
@@ -13662,9 +13656,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
             }
         }
         return ret;
-#endif
-#ifdef TARGET_NR_vmsplice
-	case TARGET_NR_vmsplice:
+    case TARGET_NR_vmsplice:
         {
             struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
             if (vec != NULL) {
@@ -13675,8 +13667,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
             }
         }
         return ret;
-#endif
-#endif /* CONFIG_SPLICE */
+
 #ifdef CONFIG_EVENTFD
 #if defined(TARGET_NR_eventfd)
     case TARGET_NR_eventfd:
-- 
2.47.3