Remove useless _C_LABEL from our assembler source.

Change-Id: I41a9181537c70ecc69ef8035132c9a83811a40d0
diff --git a/libc/arch-arm64/bionic/_setjmp.S b/libc/arch-arm64/bionic/_setjmp.S
index ea70a52..6cbf5c6 100644
--- a/libc/arch-arm64/bionic/_setjmp.S
+++ b/libc/arch-arm64/bionic/_setjmp.S
@@ -105,7 +105,7 @@
 
     /* validation failed, die die die */
 botch:
-    bl      PIC_SYM(_C_LABEL(longjmperror), PLT)
-    bl      PIC_SYM(_C_LABEL(abort), PLT)
+    bl      PIC_SYM(longjmperror, PLT)
+    bl      PIC_SYM(abort, PLT)
     b        . - 8       /* Cannot get here */
 END(_longjmp)