cleanup: rename c_init_header_info() into ip_header_info_new(), add ip_header_info_free()
cleanup: rename c_init_header_info() into ip_header_info_new(), add ip_header_info_free()

didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc