gdb_test.go and testdata implement a go test to compare and verify that
we get correct results from the scanner.
testdata/simple.c is a small program that embeds Python and runs the
same code as in runforever.py. The Makefile compiles this using
python3.7. Adjustments to the flags might be needed in your environment
gdb_test.go contains only one test, TestSimpleGDB, that
1. compiles simple.c
2. runs it multiple times
3. calls gdb to extract the address of symbol _PyRuntime for each pid
4. runs our Scanner
5. compares the results from gdb and our scanner
