Linux install: Setup GCC

.github/workflows/LinuxInstall.yml

@@ -12,6 +12,12 @@ jobs:
         uses: actions/checkout@v4
         with:
           path: pdf4qt
+          
+      - name: Set up GCC
+        uses: egor-tensin/setup-gcc@v1
+        with:
+          version: latest
+          platform: x64
 
       - name: 'VCPKG: Set up VCPKG'
         run: |