emacs: make gnutls dependency required instead of optional
emacs: make gnutls dependency required instead of optional

If Emacs is not built with GnuTLS, then it cannot make HTTPS
connections, meaning it is impossible to install packages without
installing workarounds. This is undesirable default behavior.

Closes #27942.

Signed-off-by: ilovezfs <fbd54dbbcf9e596abad4ccdc4dfc17f80ebeaee2@icloud.com>

mbcoguno/homebrew-core,JCount/homebrew-core,Linuxbrew/homebrew-core,spaam/homebrew-core,uyjulian/homebrew-core,mahori/homebrew-core,lemzwerg/homebrew-core,LinuxbrewTestBot/homebrew-core,DomT4/homebrew-core,Moisan/homebrew-core,adamliter/homebrew-core,jdubois/homebrew-core,jvillard/homebrew-core,jdubois/homebrew-core,mfikes/homebrew-core,ilovezfs/homebrew-core,edporras/homebrew-core,nandub/homebrew-core,maxim-belkin/homebrew-core,battlemidget/homebrew-core,mvitz/homebrew-core,zyedidia/homebrew-core,jabenninghoff/homebrew-core,lemzwerg/homebrew-core,adam-moss/homebrew-core,jabenninghoff/homebrew-core,dsXLII/homebrew-core,wolffaxn/homebrew-core,JCount/homebrew-core,LinuxbrewTestBot/homebrew-core,adam-moss/homebrew-core,nbari/homebrew-core,git-lfs/homebrew-core,rwhogg/homebrew-core,git-lfs/homebrew-core,aabdnn/homebrew-core,mahori/homebrew-core,chrisfinazzo/homebrew-core,battlemidget/homebrew-core,chrisfinazzo/homebrew-core,wolffaxn/homebrew-core,DomT4/homebrew-core,phusion/homebrew-core,bcg62/homebrew-core,sjackman/homebrew-core,bcg62/homebrew-core,zmwangx/homebrew-core,Homebrew/homebrew-core,jvillard/homebrew-core,dsXLII/homebrew-core,sjackman/homebrew-core,bcg62/homebrew-core,jdubois/homebrew-core,FinalDes/homebrew-core,mbcoguno/homebrew-core,makigumo/homebrew-core,cblecker/homebrew-core,zmwangx/homebrew-core,lembacon/homebrew-core,bigbes/homebrew-core,mbcoguno/homebrew-core,stgraber/homebrew-core,jvillard/homebrew-core,edporras/homebrew-core,bigbes/homebrew-core,Linuxbrew/homebrew-core,mfikes/homebrew-core,filcab/homebrew-core,Moisan/homebrew-core,Homebrew/homebrew-core,uyjulian/homebrew-core,filcab/homebrew-core,spaam/homebrew-core,mvitz/homebrew-core,BrewTestBot/homebrew-core,smessmer/homebrew-core,lembacon/homebrew-core,zyedidia/homebrew-core,mvitz/homebrew-core,stgraber/homebrew-core,adamliter/homebrew-core,phusion/homebrew-core,ilovezfs/homebrew-core,maxim-belkin/homebrew-core,lembacon/homebrew-core,cblecker/homebrew-core,rwhogg/homebrew-core,makigumo/homebrew-core,smessmer/homebrew-core,aabdnn/homebrew-core,wolffaxn/homebrew-core,nandub/homebrew-core,BrewTestBot/homebrew-core,nbari/homebrew-core,FinalDes/homebrew-core