git-annex: force-enable "webapp" flag
git-annex: force-enable "webapp" flag

To address issue Homebrew/homebrew#47346 (git-annex-webapp missing), we explicitly
enable the "webapp" flag for git-annex. This should prevent git-annex
from being built without the webapp and make the build fail if there is
e.g. a dependency issue.

Closes Homebrew/homebrew#47950.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

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