disable amazonka-ec2: using too much memory (brendanhay/amazonka#549)

    [280 of 280] Compiling Network.AWS.EC2
    gcc: error: .stack-work/dist/x86_64-linux/Cabal-3.0.0.0/build/Network/AWS/EC2/Types/Product.dyn_o: No such file or directory
    `gcc' failed in phase `Linker'. (Exit code: 1)

also

--  While building package amazonka-ec2-1.6.1 using:
      /var/stackage/.stack/setup-exe-cache/x86_64-linux/Cabal-simple_mPHDZzAJ_3.0.0.0_ghc-8.8.1 --builddir=.stack-work/dist/x86_64-linux/Cabal-3.0.0.0 build lib:amazonka-ec2 test:amazonka-ec2-test --ghc-options ""
    Process exited with code: ExitFailure (-9) (THIS MAY INDICATE OUT OF MEMORY)

    Logs have been written to: /var/stackage/work/unpack-dir/.stack-work/logs/amazonka-ec2-1.6.1.log

    Preprocessing library for amazonka-ec2-1.6.1..
    Building library for amazonka-ec2-1.6.1..
    [  3 of 280] Compiling Network.AWS.EC2.Types.Product

build-constraints.yaml

@@ -1623,7 +1623,7 @@ packages:
         - amazonka-ds
         - amazonka-dynamodb
         - amazonka-dynamodb-streams
-        - amazonka-ec2
+        # - amazonka-ec2 # https://github.com/brendanhay/amazonka/issues/549
         - amazonka-ecr
         - amazonka-ecs
         - amazonka-efs