fix: remove deprecated bpf-sdk, localnet, and examples

BREAKING CHANGE: Removed binaries solana-localnet and solana-bpf-sdk-install.
Please install the Solana CLI tools to download the BPF SDK and to
install the solana-test-validator binary intead.

web3.js/.travis/before_install.sh

@@ -9,10 +9,6 @@ sudo apt-get install -y libssl-dev --allow-unauthenticated
 sudo apt-get install -y libssl1.1 --allow-unauthenticated
 clang-7 --version
 
-curl https://sh.rustup.rs -sSf | sh -s -- -y
-PATH=$HOME/.cargo/bin:$PATH
-rustup --version
-
 sh -c "$(curl -sSfL https://release.solana.com/edge/install)"
 PATH="$HOME/.local/share/solana/install/active_release/bin:$PATH"
 solana --version

web3.js/.travis/script.sh

@@ -10,7 +10,5 @@ test -r lib/index.esm.js
 npm run doc
 npm run lint
 npm run codecov
-make -C examples/bpf-c-noop/
-cargo build-bpf --manifest-path examples/bpf-rust-noop/Cargo.toml
 npm run test:live-with-test-validator
 npm run test:browser-with-test-validator