Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/arch-arm64/syscalls/fstatat64.S b/libc/arch-arm64/syscalls/fstatat64.S
index 97e0634..0f3ef4d 100644
--- a/libc/arch-arm64/syscalls/fstatat64.S
+++ b/libc/arch-arm64/syscalls/fstatat64.S
@@ -20,5 +20,5 @@
     ret
 END(fstatat64)
 
-    .globl _C_LABEL(fstatat)
-    .equ _C_LABEL(fstatat), _C_LABEL(fstatat64)
+    .globl fstatat
+    .equ fstatat, fstatat64