Re-add sympy.thridparty to setup.py
Re-add sympy.thridparty to setup.py

It was incorrectly removed before.  Even though we have the pyglet stuff
separate in the setup.py file, we still need to have sympy.thirdparty
because of sympy/thirdparty/__init__.py.  See issue 2502.

rahuldan/sympy,jamesblunt/sympy,ga7g08/sympy,Mitchkoens/sympy,drufat/sympy,bukzor/sympy,sampadsaha5/sympy,sahilshekhawat/sympy,flacjacket/sympy,Curious72/sympy,skidzo/sympy,beni55/sympy,AkademieOlympia/sympy,pbrady/sympy,debugger22/sympy,hrashk/sympy,saurabhjn76/sympy,hargup/sympy,ga7g08/sympy,atsao72/sympy,jaimahajan1997/sympy,dqnykamp/sympy,Shaswat27/sympy,amitjamadagni/sympy,MechCoder/sympy,aktech/sympy,Vishluck/sympy,Curious72/sympy,pandeyadarsh/sympy,Davidjohnwilson/sympy,sampadsaha5/sympy,asm666/sympy,kumarkrishna/sympy,aktech/sympy,farhaanbukhsh/sympy,beni55/sympy,emon10005/sympy,maniteja123/sympy,oliverlee/sympy,yukoba/sympy,saurabhjn76/sympy,Arafatk/sympy,kmacinnis/sympy,grevutiu-gabriel/sympy,abhiii5459/sympy,vipulroxx/sympy,AunShiLord/sympy,Titan-C/sympy,grevutiu-gabriel/sympy,hargup/sympy,Shaswat27/sympy,Vishluck/sympy,lidavidm/sympy,debugger22/sympy,maniteja123/sympy,lindsayad/sympy,jbbskinny/sympy,kaushik94/sympy,MechCoder/sympy,Sumith1896/sympy,diofant/diofant,emon10005/sympy,jerli/sympy,drufat/sympy,AkademieOlympia/sympy,abloomston/sympy,kaushik94/sympy,oliverlee/sympy,lidavidm/sympy,Curious72/sympy,kaichogami/sympy,atreyv/sympy,ga7g08/sympy,sunny94/temp,Designist/sympy,skirpichev/omg,VaibhavAgarwalVA/sympy,vipulroxx/sympy,postvakje/sympy,madan96/sympy,pbrady/sympy,yashsharan/sympy,cccfran/sympy,pandeyadarsh/sympy,Designist/sympy,maniteja123/sympy,yukoba/sympy,chaffra/sympy,sahmed95/sympy,wanglongqi/sympy,abhiii5459/sympy,skidzo/sympy,kaushik94/sympy,minrk/sympy,ChristinaZografou/sympy,MridulS/sympy,Titan-C/sympy,asm666/sympy,lidavidm/sympy,VaibhavAgarwalVA/sympy,toolforger/sympy,yukoba/sympy,shipci/sympy,iamutkarshtiwari/sympy,kevalds51/sympy,shikil/sympy,sahilshekhawat/sympy,lindsayad/sympy,liangjiaxing/sympy,ChristinaZografou/sympy,Gadal/sympy,ahhda/sympy,rahuldan/sympy,Gadal/sympy,sampadsaha5/sympy,bukzor/sympy,yashsharan/sympy,postvakje/sympy,jaimahajan1997/sympy,cswiercz/sympy,souravsingh/sympy,kaichogami/sympy,cccfran/sympy,mafiya69/sympy,MridulS/sympy,souravsingh/sympy,Sumith1896/sympy,atsao72/sympy,shipci/sympy,Gadal/sympy,cswiercz/sympy,hrashk/sympy,kaichogami/sympy,minrk/sympy,garvitr/sympy,Designist/sympy,kmacinnis/sympy,dqnykamp/sympy,cccfran/sympy,atreyv/sympy,kevalds51/sympy,madan96/sympy,dqnykamp/sympy,AunShiLord/sympy,chaffra/sympy,jbbskinny/sympy,chaffra/sympy,atsao72/sympy,drufat/sympy,lindsayad/sympy,wyom/sympy,asm666/sympy,vipulroxx/sympy,VaibhavAgarwalVA/sympy,farhaanbukhsh/sympy,Mitchkoens/sympy,sunny94/temp,shikil/sympy,liangjiaxing/sympy,garvitr/sympy,Davidjohnwilson/sympy,srjoglekar246/sympy,abloomston/sympy,pandeyadarsh/sympy,jamesblunt/sympy,ahhda/sympy,liangjiaxing/sympy,sunny94/temp,sahilshekhawat/sympy,sahmed95/sympy,Davidjohnwilson/sympy,iamutkarshtiwari/sympy,rahuldan/sympy,kevalds51/sympy,hargup/sympy,AunShiLord/sympy,mafiya69/sympy,farhaanbukhsh/sympy,AkademieOlympia/sympy,ahhda/sympy,abloomston/sympy,jerli/sympy,Titan-C/sympy,wanglongqi/sympy,Vishluck/sympy,madan96/sympy,garvitr/sympy,pbrady/sympy,iamutkarshtiwari/sympy,mcdaniel67/sympy,amitjamadagni/sympy,souravsingh/sympy,sahmed95/sympy,debugger22/sympy,cswiercz/sympy,kumarkrishna/sympy,mcdaniel67/sympy,kumarkrishna/sympy,wanglongqi/sympy,yashsharan/sympy,moble/sympy,bukzor/sympy,postvakje/sympy,jaimahajan1997/sympy,shipci/sympy,emon10005/sympy,meghana1995/sympy,atreyv/sympy,saurabhjn76/sympy,Shaswat27/sympy,Sumith1896/sympy,skidzo/sympy,ChristinaZografou/sympy,jbbskinny/sympy,grevutiu-gabriel/sympy,aktech/sympy,abhiii5459/sympy,shikil/sympy,jerli/sympy,Arafatk/sympy,moble/sympy,kmacinnis/sympy,beni55/sympy,jamesblunt/sympy,Mitchkoens/sympy,wyom/sympy,moble/sympy,toolforger/sympy,MridulS/sympy,mafiya69/sympy,hrashk/sympy,MechCoder/sympy,meghana1995/sympy,wyom/sympy,oliverlee/sympy,mcdaniel67/sympy,meghana1995/sympy,toolforger/sympy,Arafatk/sympy