* print.c: Make symbols static if they're not exported.

* print.c: Make symbols static if they're not exported.

(print_depth, new_backquote_output, being_printed, print_buffer):
(print_buffer_size, print_buffer_pos, print_buffer_pos_byte):
(print_interval, print_number_index, initial_stderr_stream):
Now static.
* lisp.h (Fprinc): Remove decl.
(debug_output_compilation_hack): Mark as externally visible.