ci: Build with libxinerama-dev

Fixes unused imports warnings and, more importantly, actually builds the
code that is then used by xmonad and many others.

.github/workflows/haskell-ci.yml

@@ -44,7 +44,7 @@ jobs:
           apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr curl git software-properties-common
           apt-add-repository -y 'ppa:hvr/ghc'
           apt-get update
-          apt-get install -y $CC cabal-install-3.4 libx11-dev libxext-dev libxrandr-dev libxss-dev
+          apt-get install -y $CC cabal-install-3.4 libx11-dev libxext-dev libxinerama-dev libxrandr-dev libxss-dev
         env:
           CC: ${{ matrix.compiler }}
       - name: Set PATH and environment variables

.github/workflows/stack.yml

@@ -27,6 +27,7 @@ jobs:
           sudo apt install -y \
             libx11-dev \
             libxext-dev \
+            libxinerama-dev \
             libxrandr-dev \
             libxss-dev \
             #

cabal.haskell-ci

@@ -1,2 +1,2 @@
-apt: libx11-dev libxext-dev libxrandr-dev libxss-dev
+apt: libx11-dev libxext-dev libxinerama-dev libxrandr-dev libxss-dev
 github-patches: .github/workflows/haskell-ci.yml.patch