Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/arch-arm64/syscalls/fallocate.S b/libc/arch-arm64/syscalls/fallocate.S
index e79b96a..15e727d 100644
--- a/libc/arch-arm64/syscalls/fallocate.S
+++ b/libc/arch-arm64/syscalls/fallocate.S
@@ -20,5 +20,5 @@
     ret
 END(fallocate)
 
-    .globl _C_LABEL(fallocate64)
-    .equ _C_LABEL(fallocate64), _C_LABEL(fallocate)
+    .globl fallocate64
+    .equ fallocate64, fallocate