OS-7095 Want risc-v disassembler

@@ -22,10 +22,11 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  * Copyright 2012 Joshua M. Clulow <josh@sysmgr.org>
  * Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright 2018, Joyent, Inc.
  */
 
 #include <libdisasm.h>
 #include <stdlib.h>
 #ifdef DIS_STANDALONE

@@ -53,10 +54,13 @@
 extern dis_arch_t dis_arch_sparc;
 #endif
 #if !defined(DIS_STANDALONE) || defined(__s390) || defined(__s390x)
 extern dis_arch_t dis_arch_s390;
 #endif
+#if !defined(DIS_STANDALONE) || defined(__riscv)
+extern dis_arch_t dis_arch_riscv;
+#endif
 
 static dis_arch_t *dis_archs[] = {
 #if !defined(DIS_STANDALONE) || defined(__i386) || defined(__amd64)
         &dis_arch_i386,
 #endif

@@ -64,10 +68,13 @@
         &dis_arch_sparc,
 #endif
 #if !defined(DIS_STANDALONE) || defined(__s390) || defined(__s390x)
         &dis_arch_s390,
 #endif
+#if !defined(DIS_STANDALONE) || defined(__riscv)
+        &dis_arch_riscv,
+#endif
         NULL
 };
 
 /*
  * For the standalone library, we need to link against mdb's malloc/free.