compel: Add helpers for hgen bdesc filling

These names are generated by compel hgen, so there's no
need in making callers know them.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/include/uapi/handle-elf.h

@@ -12,4 +12,12 @@ typedef struct {
 	long		value;
 } compel_reloc_t;
 
+/*
+ * Helpers for compel hgen command results. The pref should match
+ * the -p|--sym-prefix argument value.
+ */
+#define COMPEL_H_PARASITE_HEAD(pref)	pref##__export_parasite_head_start
+#define COMPEL_H_PARASITE_CMD(pref)	pref##__export_parasite_cmd
+#define COMPEL_H_PARASITE_ARGS(pref)	pref##__export_parasite_args
+
 #endif