Fix build by avoiding the _C_LABEL macro.

Change-Id: Ide367c2b65071388bd95fbc81a4ed6ae94aec4e4
diff --git a/libc/arch-mips64/syscalls/pread64.S b/libc/arch-mips64/syscalls/pread64.S
index b752147..a97a1d4 100644
--- a/libc/arch-mips64/syscalls/pread64.S
+++ b/libc/arch-mips64/syscalls/pread64.S
@@ -30,5 +30,5 @@
     .set pop
     .end pread64
 
-    .globl _C_LABEL(pread)
-    .equ _C_LABEL(pread), _C_LABEL(pread64)
+    .globl pread
+    .equ pread, pread64