Remove useless _C_LABEL from our assembler source.

Change-Id: I41a9181537c70ecc69ef8035132c9a83811a40d0
diff --git a/libc/arch-arm/bionic/_setjmp.S b/libc/arch-arm/bionic/_setjmp.S
index 6b8aa50..239947e 100644
--- a/libc/arch-arm/bionic/_setjmp.S
+++ b/libc/arch-arm/bionic/_setjmp.S
@@ -107,7 +107,7 @@
 
 	/* 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)