Fix overly defensive handling of src parameter in make_relative_symlink
Fix overly defensive handling of src parameter in make_relative_symlink

This method is for internal use only. It is unsuitable for use in
formulae, which should use install_symlink to create relative symlinks.
Thus callers are required to pass a Pathname, not a string, and we can
remove this conditional.

Further, if src is not absolute, then src.relative_path_from(dirname)
will fail. All callers currently pass absolute pathnames. Therefore we
don't need to call expand_path when printing it.

mahori/brew,Linuxbrew/brew,Homebrew/brew,claui/brew,gordonmcshane/homebrew,AnastasiaSulyagina/brew,claui/brew,gregory-nisbet/brew,ilovezfs/brew,DomT4/brew,muellermartin/dist,reelsense/brew,palxex/brew,Homebrew/brew,Linuxbrew/brew,nandub/brew,AnastasiaSulyagina/brew,aw1621107/brew,bfontaine/brew,JCount/brew,konqui/brew,maxim-belkin/brew,Linuxbrew/brew,AnastasiaSulyagina/brew,zmwangx/brew,vitorgalvao/brew,DomT4/brew,vitorgalvao/brew,amar-laksh/brew_sudo,konqui/brew,MikeMcQuaid/brew,nandub/brew,mahori/brew,pseudocody/brew,bfontaine/brew,reelsense/brew,reitermarkus/brew,vitorgalvao/brew,tonyg/homebrew,MikeMcQuaid/brew,EricFromCanada/brew,mahori/brew,bfontaine/brew,sjackman/homebrew,gordonmcshane/homebrew,konqui/brew,amar-laksh/brew_sudo,reitermarkus/brew,Homebrew/brew,pseudocody/brew,mgrimes/brew,JCount/brew,Linuxbrew/brew,MikeMcQuaid/brew,rwhogg/brew,pseudocody/brew,ilovezfs/brew,EricFromCanada/brew,mistydemeo/homebrew,toonetown/homebrew,hanxue/linuxbrew,sjackman/homebrew,claui/brew,staticfloat/brew,maxim-belkin/brew,staticfloat/brew,reelsense/brew,sjackman/homebrew,gregory-nisbet/brew,ilovezfs/brew,EricFromCanada/brew,alyssais/brew,palxex/brew,tonyg/homebrew,DomT4/brew,toonetown/homebrew,aw1621107/brew,zmwangx/brew,nandub/brew,alyssais/brew,maxim-belkin/brew,alyssais/brew,nandub/brew,jmsundar/brew,gregory-nisbet/brew,reitermarkus/brew,amar-laksh/brew_sudo,rwhogg/brew,hanxue/linuxbrew,toonetown/homebrew,claui/brew,reitermarkus/brew,MikeMcQuaid/brew,hanxue/linuxbrew,muellermartin/dist,zmwangx/brew,jmsundar/brew,DomT4/brew,tonyg/homebrew,mahori/brew,muellermartin/dist,EricFromCanada/brew,palxex/brew,sjackman/homebrew,staticfloat/brew,mgrimes/brew,konqui/brew,rwhogg/brew,mgrimes/brew,aw1621107/brew,mistydemeo/homebrew,jmsundar/brew,Homebrew/brew,JCount/brew,gordonmcshane/homebrew,JCount/brew,mistydemeo/homebrew,vitorgalvao/brew