add the gcc4.8 back to original matrix

Author: phlptp

.ci/azure-build.yml

@@ -1,7 +1,7 @@
 steps:
   # Needed on GCC 4.8 docker image for some reason
   - script: mkdir build
-    displalyName: "Make build directory"
+    displayName: "Make build directory"
 
   - task: CMake@1
     inputs:

azure-pipelines.yml

@@ -109,6 +109,10 @@ jobs:
         gcc8:
           containerImage: gcc:8
           cli11.std: 17
+        gcc4.8:
+          containerImage: helics/buildenv:gcc4-8-builder
+          cli11.std: 11
+          cli11.options:
         clang3.4:
           containerImage: silkeh/clang:3.4
           cli11.std: 11