git-annex.cabal: Move webapp build deps under the Assistant build flag so
git-annex can be built again without yesod etc installed.
Commit 78440ca37d got rid of the webapp build
flag to work around what was apparently a cabal bug. It moved the webapp
build deps to the main build-depends list. But that prevents building
git-annex when yesod etc are not installed.
Putting them under the Assistant build flag seems to not tickle that cabal
bug, and lets git-annex build automatically with the assistant disabled
when the webapp build deps are not installed.
I hypotehesize that the problem may have involved build-depends nested
behind two build flags. Also, cabal clean may need to be run in order
for cabal to find the right solution after this change, when building in
a directory where cabal configure had been run before.
Also moved 3 modules that are needed to build git-annex w/o the assistant
out from under the Assistant build flag.
Sponsored-by: Brock Spratlen on Patreon
git-annex allows managing large files with git, without storing the file
contents in git. It can sync, backup, and archive your data, offline
and online. Checksums and encryption keep your data safe and secure. Bring
the power and distributed nature of git to bear on your large files with
git-annex.
For documentation, see doc/ or <https://git-annex.branchable.com/>
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