Remove useless _C_LABEL from our assembler source.

Change-Id: I41a9181537c70ecc69ef8035132c9a83811a40d0
diff --git a/libc/arch-arm/bionic/abort_arm.S b/libc/arch-arm/bionic/abort_arm.S
index 1aaf21a..1d01ed2 100644
--- a/libc/arch-arm/bionic/abort_arm.S
+++ b/libc/arch-arm/bionic/abort_arm.S
@@ -40,5 +40,5 @@
     .cfi_def_cfa_offset 8
     .cfi_rel_offset r3, 0
     .cfi_rel_offset r14, 4
-    bl      PIC_SYM(_C_LABEL(__libc_android_abort), PLT)
+    bl      PIC_SYM(__libc_android_abort, PLT)
 END(abort)