do not download jom anymore in windows workflows

.github/workflows/CreateRelease.yml

@@ -163,12 +163,6 @@ jobs:
       with:
         ref: master
         submodules: true
-    - name: Download Jom
-      run: |
-        Invoke-WebRequest -Uri "http://mirrors.ukfast.co.uk/sites/qt.io/official_releases/jom/jom_1_1_3.zip" -OutFile "jom_1_1_3.zip"
-        New-Item -Name "jom" -ItemType "directory"
-        Expand-Archive -Path jom_1_1_3.zip -DestinationPath .\jom
-        echo "$(Get-Location)\jom" >> GITHUB_PATH
     - name: Setup MSVC
       uses: ilammy/msvc-dev-cmd@v1
     - name: Install Qt

.github/workflows/Windows.yml

@@ -14,12 +14,6 @@ jobs:
     - uses: actions/checkout@v2
       with:
         submodules: true
-    - name: Download Jom
-      run: |
-        Invoke-WebRequest -Uri "http://mirrors.ukfast.co.uk/sites/qt.io/official_releases/jom/jom_1_1_3.zip" -OutFile "jom_1_1_3.zip"
-        New-Item -Name "jom" -ItemType "directory"
-        Expand-Archive -Path jom_1_1_3.zip -DestinationPath .\jom
-        echo "$(Get-Location)\jom" >> GITHUB_PATH
     - name: Setup MSVC
       uses: ilammy/msvc-dev-cmd@v1
     - name: Install Qt

scripts/Windows/1_build.sh

@@ -16,7 +16,6 @@ SCRIPTS_PATH="$(dirname "$(realpath "$0")")"
 SOURCE_PATH=$SCRIPTS_PATH/../../src
 BUILD_PATH=$SOURCE_PATH/build
 INSTALL_PATH=$SOURCE_PATH/install
-CORES="-j4"
 DOUBLE_PRECISION_OPTION=""
 NIGHTLY_OPTION=""
 RC_OPTION=""
@@ -33,10 +32,6 @@ case $i in
         INSTALL_PATH="${i#*=}"
         shift # past argument=value
         ;;
-    -j*)
-        CORES=$i
-        shift # past argument=value
-        ;;
     -d|--double_precision)
         DOUBLE_PRECISION_OPTION="-DBUILD_WITH_DOUBLE_SCALAR=ON"
         shift # past argument=value