$NetBSD$

Add support for sparc64.

From OpenBSD ports.

--- Source/JavaScriptCore/CMakeLists.txt.orig	Tue Feb 28 09:34:11 2017
+++ Source/JavaScriptCore/CMakeLists.txt	Sun Mar 26 13:55:13 2017
@@ -1481,6 +1481,7 @@ elseif (WTF_CPU_PPC64)
 elseif (WTF_CPU_PPC64LE)
 elseif (WTF_CPU_S390)
 elseif (WTF_CPU_S390X)
+elseif (WTF_CPU_SPARC64)
 elseif (WTF_CPU_MIPS)
 elseif (WTF_CPU_SH4)
 elseif (WTF_CPU_X86)
