Enable BPF shared objects (#2012)

* Switch to BPF ELF shared objects (.so)

tests/programs.rs

@@ -26,7 +26,7 @@ use std::path::PathBuf;
 
 /// BPF program file extension
 #[cfg(feature = "bpf_c")]
-const PLATFORM_FILE_EXTENSION_BPF: &str = "o";
+const PLATFORM_FILE_EXTENSION_BPF: &str = "so";
 /// Create a BPF program file name
 #[cfg(feature = "bpf_c")]
 fn create_bpf_path(name: &str) -> PathBuf {