A workaround for GHC linking problem "unknown symbol ..."
A workaround for GHC linking problem "unknown symbol ..."

GHC 7.4 on Debian Wheezy fails to compile after some TH related changes,
reporting

  ghc: src/Ganeti/JSON.o: unknown symbol
    `attoparseczm0zi11zi1zi0_DataziAttoparsecziText_zdwf_info`

This doesn't happen on Squeeze. Explicitly importing attoparsec in THH
fixes the problem.

Signed-off-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

dimara/ganeti,onponomarev/ganeti,bitemyapp/ganeti,mbakke/ganeti,apyrgio/ganeti,leshchevds/ganeti,leshchevds/ganeti,grnet/snf-ganeti,andir/ganeti,bitemyapp/ganeti,grnet/snf-ganeti,leshchevds/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,andir/ganeti,mbakke/ganeti,mbakke/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,onponomarev/ganeti,ganeti/ganeti,apyrgio/ganeti,ganeti/ganeti,dimara/ganeti,andir/ganeti,yiannist/ganeti