Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/arch-x86_64/syscalls/getrlimit.S b/libc/arch-x86_64/syscalls/getrlimit.S
index 0b3536c..6a9c9b6 100644
--- a/libc/arch-x86_64/syscalls/getrlimit.S
+++ b/libc/arch-x86_64/syscalls/getrlimit.S
@@ -15,5 +15,5 @@
     ret
 END(getrlimit)
 
-    .globl _C_LABEL(getrlimit64)
-    .equ _C_LABEL(getrlimit64), _C_LABEL(getrlimit)
+    .globl getrlimit64
+    .equ getrlimit64, getrlimit