Fix random compile c tool

Author: adfoster-r7

tools/exploit/random_compile_c.rb

@@ -16,7 +16,7 @@ def help
   msfbase = File.expand_path(File.readlink(msfbase), File.dirname(msfbase))
 end
 $:.unshift(File.expand_path(File.join(File.dirname(msfbase), '..', '..', 'lib')))
-
+require 'msfenv'
 require 'metasploit/framework/compiler/windows'
 
 weight = ARGV.shift