Dave Tucker adf16e2102 test: Reproduce relocation bug
Users have reported issues with programs failing the verifier when they
are attempting to read or write to variables that the compiler places in
the .bss section. Add a test that places variables in each section and
exercises read and write operations on them.

Signed-off-by: Dave Tucker <dave@dtucker.co.uk>
..
ext.bpf.c integration-test: avoid reliance on kernel headers
main.bpf.c integration-test: avoid reliance on kernel headers
multimap-btf.bpf.c integration-test: Add map pinning coverage
reloc.bpf.c aya-obj: Handle lack of match of enum variants correctly
text_64_64_reloc.c integration-test: avoid reliance on kernel headers
variables_reloc.bpf.c test: Reproduce relocation bug