Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/arch-x86_64/syscalls/setrlimit.S b/libc/arch-x86_64/syscalls/setrlimit.S
index e445ec0..dd393ae 100644
--- a/libc/arch-x86_64/syscalls/setrlimit.S
+++ b/libc/arch-x86_64/syscalls/setrlimit.S
@@ -15,5 +15,5 @@
     ret
 END(setrlimit)
 
-    .globl _C_LABEL(setrlimit64)
-    .equ _C_LABEL(setrlimit64), _C_LABEL(setrlimit)
+    .globl setrlimit64
+    .equ setrlimit64, setrlimit