Add gcc to the prequisites list

was looking at my logs for a sanity.system test and I noticed that it used GCC. I then went to the prerequisites list and I noticed that GCC was not listed.
Can you please update the prerequisite list to indicate that GCC is required and which version is needed if applicable?
Related to eclipse/openj9#4208

Find the repository's prerequisite list and compare it with the sanity.system test setup; the issue provides no file path. Check related issue eclipse/openj9#4208 for the required GCC version, then update the list and verify it reflects the test's dependency.

Written by the indexing model from the issue text.