Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/arch-x86/syscalls/fstatat64.S b/libc/arch-x86/syscalls/fstatat64.S
index 4b98e88..05cec7b 100644
--- a/libc/arch-x86/syscalls/fstatat64.S
+++ b/libc/arch-x86/syscalls/fstatat64.S
@@ -33,5 +33,5 @@
     ret
 END(fstatat64)
 
-    .globl _C_LABEL(fstatat)
-    .equ _C_LABEL(fstatat), _C_LABEL(fstatat64)
+    .globl fstatat
+    .equ fstatat, fstatat64