Remove RC4_options from rc4-586.pl.

The x86-64 version of this assembly doesn't include this function. It's
in decrepit/rc4 as a compatibility backfill but that means that 32-bit
builds end up with two definitions of this symbol.

Change-Id: Ib6da6b91aded8efc679ebbae6d60c96a78f3dc4e
Reviewed-on: https://boringssl-review.googlesource.com/7734
Reviewed-by: David Benjamin <davidben@google.com>

crypto/rc4/asm/rc4-586.pl

@@ -384,31 +384,5 @@ $idx="edx";
 	&mov	(&DWP(-4,$out),"eax");		# key->y=0;
 &function_end("asm_RC4_set_key");
 
-# const char *RC4_options(void);
-&function_begin_B("RC4_options");
-	&call	(&label("pic_point"));
-&set_label("pic_point");
-	&blindpop("eax");
-	&lea	("eax",&DWP(&label("opts")."-".&label("pic_point"),"eax"));
-	&picmeup("edx","OPENSSL_ia32cap_P");
-	&mov	("edx",&DWP(0,"edx"));
-	&bt	("edx",20);
-	&jc	(&label("1xchar"));
-	&bt	("edx",26);
-	&jnc	(&label("ret"));
-	&add	("eax",25);
-	&ret	();
-&set_label("1xchar");
-	&add	("eax",12);
-&set_label("ret");
-	&ret	();
-&set_label("opts",64);
-&asciz	("rc4(4x,int)");
-&asciz	("rc4(1x,char)");
-&asciz	("rc4(8x,mmx)");
-&asciz	("RC4 for x86, CRYPTOGAMS by <appro\@openssl.org>");
-&align	(64);
-&function_end_B("RC4_options");
-
 &asm_finish();