Remove useless _C_LABEL from our assembler source.

Change-Id: I41a9181537c70ecc69ef8035132c9a83811a40d0
diff --git a/libc/arch-arm/bionic/sigsetjmp.S b/libc/arch-arm/bionic/sigsetjmp.S
index 12311e5..59ab9da 100644
--- a/libc/arch-arm/bionic/sigsetjmp.S
+++ b/libc/arch-arm/bionic/sigsetjmp.S
@@ -50,8 +50,8 @@
 
 ENTRY(sigsetjmp)
 	teq	r1, #0
-	beq	PIC_SYM(_C_LABEL(_setjmp), PLT)
-	b	PIC_SYM(_C_LABEL(setjmp), PLT)
+	beq	PIC_SYM(_setjmp, PLT)
+	b	PIC_SYM(setjmp, PLT)
 END(sigsetjmp)
 
 .L_setjmp_magic:
@@ -61,6 +61,6 @@
 	ldr	r2, .L_setjmp_magic
 	ldr	r3, [r0]
 	teq	r2, r3
-	beq	PIC_SYM(_C_LABEL(_longjmp), PLT)
-	b	PIC_SYM(_C_LABEL(longjmp), PLT)
+	beq	PIC_SYM(_longjmp, PLT)
+	b	PIC_SYM(longjmp, PLT)
 END(siglongjmp)