Proposal: log binary data for Solidity

Rename "Program return data: " to "Program return: " since "data" is
redundant.

(cherry picked from commit b89177c8de)

Conflicts:
	programs/bpf_loader/src/syscalls.rs
	sdk/bpf/c/inc/sol/log.h
	sdk/program/Cargo.toml
	sdk/src/feature_set.rs
	sdk/src/process_instruction.rs

programs/bpf_loader/src/lib.rs

@@ -943,7 +943,7 @@ impl Executor for BpfExecutor {
             drop(vm);
             let return_data = invoke_context.get_return_data();
             if let Some((program_id, return_data)) = return_data {
-                stable_log::program_return_data(&logger, program_id, return_data);
+                stable_log::program_return(&logger, program_id, return_data);
             }
             match result {
                 Ok(status) => {