Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/arch-x86_64/syscalls/lseek.S b/libc/arch-x86_64/syscalls/lseek.S
index a06b3ec..cf19776 100644
--- a/libc/arch-x86_64/syscalls/lseek.S
+++ b/libc/arch-x86_64/syscalls/lseek.S
@@ -15,5 +15,5 @@
     ret
 END(lseek)
 
-    .globl _C_LABEL(lseek64)
-    .equ _C_LABEL(lseek64), _C_LABEL(lseek)
+    .globl lseek64
+    .equ lseek64, lseek