Split BPF loader to match the rest of the programs (#4636)

programs/bpf_loader_program/.gitignore

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+/target/

programs/bpf_loader_program/Cargo.toml

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+[package]
+name = "solana-bpf-loader-program"
+version = "0.16.0"
+description = "Solana BPF Loader"
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[dependencies]
+log = "0.4.2"
+solana-logger = { path = "../../logger", version = "0.16.0" }
+solana-sdk = { path = "../../sdk", version = "0.16.0" }
+solana-bpf-loader-api = { path = "../bpf_loader_api", version = "0.16.0" }
+
+[lib]
+crate-type = ["lib", "cdylib"]
+name = "solana_bpf_loader_program"

programs/bpf_loader_program/src/lib.rs

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+#[macro_export]
+macro_rules! solana_bpf_loader_program {
+    () => {
+        (
+            "solana_bpf_loader_program".to_string(),
+            solana_sdk::bpf_loader::id(),
+        )
+    };
+}
+
+use solana_bpf_loader_api::process_instruction;
+solana_sdk::solana_entrypoint!(process_instruction);