[Aarch64] Fix _lseek prototype

[Christophe Lyon]

Hi,

While building newlib for Aarch64, I noticed a warning in _lseek. This
small patch fixes the prototype.

OK?

Christophe
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commit 21997b227745a47a9257096c5cd172e17eaa823b
Author: Christophe Lyon <christophe.lyon@linaro.org>
Date:   Mon Oct 1 19:10:10 2018 +0000

    [Aarch64] Fix _lseek prototype
    
    2018-10-01  Christophe Lyon  <christophe.lyon@linaro.org>
    
    	* libgloss/aarch64/syscalls.c (_lseek): Fix prototype.

diff --git a/libgloss/aarch64/syscalls.c b/libgloss/aarch64/syscalls.c
index e6dd4bd..d6022fc 100644
--- a/libgloss/aarch64/syscalls.c
+++ b/libgloss/aarch64/syscalls.c
@@ -449,6 +449,7 @@ _swilseek (int fd, int ptr, int dir)
     return -1;
 }
 
+int
 _lseek (int fd, int ptr, int dir)
 {
   return _swilseek (fd, ptr, dir);