codegen: Fortan 90 code does not need global declaration
codegen: Fortan 90 code does not need global declaration

Fortran 77 code needs COMMON blocks but we don't generate F77
code yet.  Leave a note for future devs.

lindsayad/sympy,aktech/sympy,postvakje/sympy,drufat/sympy,wyom/sympy,ga7g08/sympy,ga7g08/sympy,bukzor/sympy,skidzo/sympy,AkademieOlympia/sympy,drufat/sympy,AkademieOlympia/sympy,iamutkarshtiwari/sympy,kaushik94/sympy,sampadsaha5/sympy,iamutkarshtiwari/sympy,rahuldan/sympy,abhiii5459/sympy,saurabhjn76/sympy,debugger22/sympy,abhiii5459/sympy,Arafatk/sympy,atsao72/sympy,kevalds51/sympy,yashsharan/sympy,abhiii5459/sympy,souravsingh/sympy,Vishluck/sympy,jaimahajan1997/sympy,kaushik94/sympy,Arafatk/sympy,ga7g08/sympy,grevutiu-gabriel/sympy,garvitr/sympy,kaichogami/sympy,Shaswat27/sympy,Designist/sympy,saurabhjn76/sympy,madan96/sympy,mafiya69/sympy,atreyv/sympy,Davidjohnwilson/sympy,oliverlee/sympy,sahmed95/sympy,kevalds51/sympy,pandeyadarsh/sympy,rahuldan/sympy,Vishluck/sympy,Davidjohnwilson/sympy,Curious72/sympy,saurabhjn76/sympy,bukzor/sympy,cswiercz/sympy,pandeyadarsh/sympy,garvitr/sympy,cswiercz/sympy,oliverlee/sympy,VaibhavAgarwalVA/sympy,Designist/sympy,ChristinaZografou/sympy,Designist/sympy,Arafatk/sympy,VaibhavAgarwalVA/sympy,sampadsaha5/sympy,wanglongqi/sympy,moble/sympy,maniteja123/sympy,sampadsaha5/sympy,garvitr/sympy,hargup/sympy,Shaswat27/sympy,debugger22/sympy,wanglongqi/sympy,farhaanbukhsh/sympy,yukoba/sympy,sahmed95/sympy,Davidjohnwilson/sympy,chaffra/sympy,Titan-C/sympy,farhaanbukhsh/sympy,emon10005/sympy,Shaswat27/sympy,madan96/sympy,kaichogami/sympy,kumarkrishna/sympy,mcdaniel67/sympy,shikil/sympy,kumarkrishna/sympy,kumarkrishna/sympy,emon10005/sympy,wyom/sympy,postvakje/sympy,atsao72/sympy,chaffra/sympy,lindsayad/sympy,oliverlee/sympy,Titan-C/sympy,ChristinaZografou/sympy,iamutkarshtiwari/sympy,mcdaniel67/sympy,atreyv/sympy,Titan-C/sympy,souravsingh/sympy,ahhda/sympy,souravsingh/sympy,sahmed95/sympy,ChristinaZografou/sympy,ahhda/sympy,maniteja123/sympy,mcdaniel67/sympy,atreyv/sympy,emon10005/sympy,mafiya69/sympy,MechCoder/sympy,rahuldan/sympy,drufat/sympy,hargup/sympy,skidzo/sympy,grevutiu-gabriel/sympy,Curious72/sympy,grevutiu-gabriel/sympy,madan96/sympy,jbbskinny/sympy,moble/sympy,shikil/sympy,AkademieOlympia/sympy,kevalds51/sympy,maniteja123/sympy,postvakje/sympy,Curious72/sympy,VaibhavAgarwalVA/sympy,pandeyadarsh/sympy,aktech/sympy,bukzor/sympy,kaushik94/sympy,shikil/sympy,kaichogami/sympy,jbbskinny/sympy,yashsharan/sympy,yukoba/sympy,jerli/sympy,jbbskinny/sympy,cswiercz/sympy,wanglongqi/sympy,mafiya69/sympy,MechCoder/sympy,MechCoder/sympy,aktech/sympy,hargup/sympy,yashsharan/sympy,chaffra/sympy,skidzo/sympy,jerli/sympy,debugger22/sympy,jerli/sympy,lindsayad/sympy,ahhda/sympy,atsao72/sympy,Vishluck/sympy,yukoba/sympy,moble/sympy,jaimahajan1997/sympy,wyom/sympy,jaimahajan1997/sympy,farhaanbukhsh/sympy