Add test to check dependent reads

[Alan-Jowett]

Test to check behavior of dependent reads.

1. Check that packet size is > 4 bytes.
2. If true, set flag.
3. If flag is set, access packet.

alanjo@alanjo-dev2:~/ebpf-verifier$ sudo ./check ebpf-samples/build/dependent_read.o --dom linux
1,0.000427,4996
alanjo@alanjo-dev2:~/ebpf-verifier$ sudo ./check ebpf-samples/build/dependent_read.o
0,0.008814,5024

Verification of this sample passes on Linux verifier, but fails with prevail.

[Alan-Jowett]

Need to account for different packet layout on Linux vs Windows.

[Alan-Jowett]

Working on getting a version that passes Linux verifier, but fails prevail.