CI: rm buildStackProject, it does not work that way, and better to use real stack

M  .travis.yml
M  build.sh

.travis.yml

@@ -66,7 +66,6 @@ env:
     - buildStrictly=false
     # NOTE: Disable core optimizations, significantly speeds up the build
     - disableOptimization=true
-    - buildStackProject=false
     # NOTE: Modify a Haskell package to add shell completion scripts for the given executable produced by it. These completion scripts will be picked up automatically if the resulting derivation is installed, e.g. by `nix-env -i`.
     # Invocation:
     #   generateOptparseApplicativeCompletions command pkg

build.sh

@@ -10,7 +10,6 @@ GHCVERSION=${GHCVERSION:-'ghc883'}
 rev=${rev:-'nixpkgs-unstable'}
 NIX_PATH=${NIX_PATH:-"nixpkgs=https://github.com/nixos/nixpkgs/archive/$rev.tar.gz"}
 export NIX_PATH
-name=${name:-'defaultBinaryName'}
 pkgName=${pkgName:-'defaultPkgName'}
 failOnAllWarnings=${failOnAllWarnings:-'false'}
 checkUnusedPackages=${checkUnusedPackages:-'false'}
@@ -24,7 +23,6 @@ enableLibraryProfiling=${enableLibraryProfiling:-'false'}
 buildFromSdist=${buildFromSdist:-'false'}
 buildStrictly=${buildStrictly:-'false'}
 disableOptimization=${disableOptimization:-'true'}
-buildStackProject=${buildStackProject:-'false'}
 # NOTE: *Oprparse* key is redifined in the code further
 generateOptparseApplicativeCompletions=${generateOptparseApplicativeCompletions:-'false'}
 allowInconsistentDependencies=${allowInconsistentDependencies:-'false'}
@@ -98,7 +96,6 @@ if [ "$GHCVERSION" = "ghcjs" ]
       --arg buildFromSdist "$buildFromSdist" \
       --arg buildStrictly "$buildStrictly" \
       --arg disableOptimization "$disableOptimization" \
-      --arg buildStackProject "$buildStackProject" \
       --arg allowInconsistentDependencies "$allowInconsistentDependencies" \
       --arg generateOptparseApplicativeCompletions "$generateOptparseApplicativeCompletions" \
       --arg executableNamesToShellComplete "$executableNamesToShellComplete" \
@@ -124,7 +121,6 @@ if [ "$GHCVERSION" = "ghcjs" ]
       --arg buildFromSdist "$buildFromSdist" \
       --arg buildStrictly "$buildStrictly" \
       --arg disableOptimization "$disableOptimization" \
-      --arg buildStackProject "$buildStackProject" \
       --arg allowInconsistentDependencies "$allowInconsistentDependencies" \
       --arg generateOptparseApplicativeCompletions "$generateOptparseApplicativeCompletions" \
       --arg executableNamesToShellComplete "$executableNamesToShellComplete"