Revert "Rename programs to instruction_processors (#3789)" (#3824)

This reverts commit 34344982a9.

programs/bpf/c/src/multiple_static/multiple_static.c

@@ -0,0 +1,10 @@
+#include <solana_sdk.h>
+
+static const char msg[] = "This is a message";
+static const char msg2[] = "This is a different message";
+
+extern bool entrypoint(const uint8_t *input) {
+  sol_log((char*)msg);
+  sol_log((char*)msg2);
+  return true;
+}