gdb: Convert language la_print_typedef field to a method
    
    This commit changes the language_data::la_print_typedef function
    pointer member variable into a member function of language_defn.
    
    There should be no user visible changes after this commit.
    
    gdb/ChangeLog:
    
    	* ada-lang.c (ada_language_data): Delete la_print_typedef
    	initializer.
    	(ada_language::print_typedef): New member function.
    	* c-lang.c (c_language_data): Delete la_print_typedef initializer.
    	(cplus_language_data): Likewise.
    	(asm_language_data): Likewise.
    	(minimal_language_data): Likewise.
    	* d-lang.c (d_language_data): Likewise.
    	* f-lang.c (f_language_data): Likewise.
    	(f_language::print_typedef): New member function.
    	* go-lang.c (go_language_data): Delete la_print_typedef
    	initializer.
    	* language.c (language_defn::print_typedef): Define member
    	function.
    	(unknown_language_data): Delete la_print_typedef initializer.
    	(unknown_language::print_typedef): New member function.
    	(auto_language_data): Delete la_print_typedef initializer.
    	(auto_language::print_typedef): New member function.
    	* language.h (language_data): Delete la_print_typedef field.
    	(language_defn::print_typedef): Declare new member function.
    	(LA_PRINT_TYPEDEF): Update call to print_typedef.
    	(default_print_typedef): Delete declaration.
    	* m2-lang.c (m2_language_data): Delete la_print_typedef
    	initializer.
    	(m2_language::print_typedef): New member function.
    	* objc-lang.c (objc_language_data): Delete la_print_typedef
    	initializer.
    	* opencl-lang.c (opencl_language_data): Likewise.
    	* p-lang.c (pascal_language_data): Likewise.
    	(pascal_language::print_typedef): New member function.
    	* rust-lang.c (rust_print_typedef): Delete function,
    	implementation moved to rust_language::print_typedef.
    	(rust_language): Delete la_print_typedef initializer.
    	(rust_language::print_typedef): New member function,
    	implementation from rust_print_typedef.
    	* typeprint.c (default_print_typedef): Delete.