CI: bench: fitting the workflow to strategy chosen

Still kept the 9.0.1 bootstrap, because the very next workflow standard GHC
update would hit the need of that code.

Author: Anton-Latukha

.github/workflows/bench.yml

@@ -34,6 +34,9 @@ jobs:
         os: [ubuntu-latest]
         cabal: ['3.6']
 
+    # This code is fitted to the strategy: assumes Linux is used ... etc,
+    # change of the strategy may require changing the bootstrapping/run code
+
     steps:
     - uses: actions/checkout@v2
 
@@ -45,13 +48,7 @@ jobs:
         cabal-version: ${{ matrix.cabal }}
         enable-stack: false
 
-    - if: runner.os == 'Windows'
-      name: (Windows) Platform config
-      run: |
-        echo "CABAL_STORE_DIR=$SYSTEMDRIVE\\SR" >> $GITHUB_ENV
-        echo "CABAL_PKGS_DIR=~\\AppData\\cabal\\packages" >> $GITHUB_ENV
-    - if: ( runner.os == 'Linux' ) || ( runner.os == 'macOS' )
-      name: (Linux,macOS) Platform config
+    - name: Platform config
       run: |
         echo "CABAL_STORE_DIR=~/.cabal/store" >> $GITHUB_ENV
         echo "CABAL_PKGS_DIR=~/.cabal/packages" >> $GITHUB_ENV
@@ -61,11 +58,6 @@ jobs:
       name: (GHC 9.0.1) Use modified `cabal.project`
       run: |
         cp cabal-ghc901.project cabal.project
-    - if: runner.os == 'Windows' && matrix.ghc == '8.8.4'
-      name: (Windows,GHC 8.8) Modify `cabal.project` to workaround segfaults
-      run: |
-        echo "package floskell" >> cabal.project
-        echo "  ghc-options: -O0" >> cabal.project
 
     # Shorten binary names as a workaround for filepath length limits in Windows,
     # but since tests are hardcoded on this workaround -