Fix module init failure due to missing require

    [06/19/2013 15:56:12] [e(0)] core: /path/to/metasploit-framework/modules/exploits/unix/webapp/havalite_upload_exec.rb failed to load due to the following error: 
    NameError
    uninitialized constant Msf::Exploit::PhpEXE
    Call stack:
    /path/to/metasploit-framework/modules/exploits/unix/webapp/havalite_upload_exec.rb:14:in `<class:Metasploit3>'
    /path/to/metasploit-framework/modules/exploits/unix/webapp/havalite_upload_exec.rb:10:in `module_eval_with_lexical_scope'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:54:in `module_eval'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:54:in `module_eval_with_lexical_scope'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:147:in `block in load_module'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:544:in `call'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:544:in `namespace_module_transaction'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:201:in `load_module'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:262:in `block in load_modules'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/directory.rb:52:in `block (2 levels) in each_module_reference_name'
    /path/to/metasploit-framework/lib/rex/file.rb:80:in `block in find'
    /path/to/metasploit-framework/lib/rex/file.rb:79:in `catch'
    /path/to/metasploit-framework/lib/rex/file.rb:79:in `find'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/directory.rb:43:in `block in each_module_reference_name'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/directory.rb:27:in `foreach'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/directory.rb:27:in `each_module_reference_name'
    /path/to/metasploit-framework/lib/msf/core/modules/loader/base.rb:260:in `load_modules'
    /path/to/metasploit-framework/lib/msf/core/module_manager/loading.rb:117:in `block in load_modules'
    /path/to/metasploit-framework/lib/msf/core/module_manager/loading.rb:115:in `each'
    /path/to/metasploit-framework/lib/msf/core/module_manager/loading.rb:115:in `load_modules'
    /path/to/metasploit-framework/lib/msf/core/module_manager/module_paths.rb:54:in `block in add_module_path'
    /path/to/metasploit-framework/lib/msf/core/module_manager/module_paths.rb:53:in `each'
    /path/to/metasploit-framework/lib/msf/core/module_manager/module_paths.rb:53:in `add_module_path'
    /path/to/metasploit-framework/lib/msf/base/simple/framework/module_paths.rb:14:in `init_module_paths'
    /path/to/metasploit-framework/lib/msf/ui/console/driver.rb:228:in `initialize'
    ./msfconsole:169:in `new'
    ./msfconsole:169:in `<main>'