Fix Ubuntu actions

The Ubuntu GitHub actions started unexpectedly failing. Adding
`python3-setuptools` to the list of installed packages fixes the issue.

.github/workflows/x86-ubuntu-llvm-from-sources-static.yml

@@ -48,6 +48,7 @@ jobs:
           ninja
       - name: Install lit
         run: |
+          sudo apt-get install python3-setuptools
           sudo pip3 install lit
       - name: Run MBASub - sanity check
         run: |

.github/workflows/x86-ubuntu-llvm-from-sources.yml

@@ -41,6 +41,7 @@ jobs:
           ninja clang opt lli not FileCheck
       - name: Install lit
         run: |
+          sudo apt-get install python3-setuptools
           sudo pip3 install lit
       - name: Build HelloWorld
         run: |

.github/workflows/x86-ubuntu.yml

@@ -19,6 +19,7 @@ jobs:
           sudo apt-add-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-12 main"
           sudo apt-get update
           sudo apt-get install -y llvm-12 llvm-12-dev clang-12 llvm-12-tools
+          sudo apt-get install python3-setuptools
           sudo pip3 install lit
       - name: Build HelloWorld
         run: |