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Problem
#26854 broke windows release builds do to the requirement of a C compiler
Summary of Changes
On windows machines, use installed protoc, instead of trying to build vendored package
Here is an example successful build: https://github.com/solana-labs/solana/runs/7721331802?check_suite_focus=true
from this branch, hacked up to run the CI job on a PR and only build the
solana-storage-proto
crateAdding protoc to $PATH instead of setting the envar should also work, if you prefer that approach @yihau .