Work around snappy linker issue with newer compilers #9517
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Summary: After #9481, we are using newer default compiler for
build-format-compatible CircleCI nightly job, which fails on building
2.2.fb.branch branch because it tries to use a pre-compiled libsnappy.a
that is checked into the repo (!). This works around that by setting
SNAPPY_LDFLAGS=-lsnappy, which is only understood by such old versions.
Test Plan: Run check_format_compatible.sh on Ubuntu 20 AWS machine,
watch nightly run