added ARCH_x64 case for Msf::Util::EXE.to_executable_fmt - failed CI rapid7#8173

Author: thenavs

lib/msf/util/exe.rb

@@ -1906,6 +1906,7 @@ def self.to_executable_fmt(framework, arch, plat, code, fmt, exeopts)
       if (not plat or (plat.index(Msf::Module::Platform::Linux)))
         output = case arch
           when ARCH_X86_64  then to_linux_x64_elf_dll(framework, code, exeopts)
+          when ARCH_64      then to_linux_x64_elf_dll(framework, code, exeopts)
           end
       end