adding the header file for all mmix global variables

mmixlib/libglobals.h

+extern tetra priority;
+extern mem_node*mem_root;
+extern mem_node*last_mem;
+extern octa sclock;
+extern octa neg_one;
+extern FILE*mmo_file;
+extern int postamble;
+extern int byte_count;
+extern byte buf[4];
+extern int yzbytes;
+extern int delta;
+extern tetra tet;
+extern octa cur_loc;
+extern int cur_file;
+extern int cur_line;
+extern octa tmp;
+extern tetra obj_time;
+extern file_node file_info[256];
+extern int ybyte2file_no[256];
+extern int buf_size;
+extern Char*buffer;
+extern FILE*src_file;
+extern int shown_file;
+extern int shown_line;
+extern int gap;
+extern bool line_shown;
+extern bool showing_source;
+extern int profile_gap;
+extern bool profile_showing_source;
+extern octa implied_loc;
+extern bool profile_started;
+extern char*special_name[32];
+extern octa w,x,y,z,a,b,ma,mb;
+extern octa*x_ptr;
+extern octa loc;
+extern octa inst_ptr;
+extern tetra inst;
+extern int old_L;
+extern int exc;
+extern unsigned int tracing_exceptions;
+extern int rop;
+extern int rzz;
+extern int round_mode;
+extern bool resuming;
+extern bool halted;
+extern bool breakpoint;
+extern bool tracing;
+extern bool trace_once;
+extern bool stack_tracing;
+extern bool interacting;
+extern bool show_operating_system;
+extern bool rw_break;
+extern octa rOlimit;
+extern int port;
+extern char*host;
+extern char localhost[];
+extern bool interact_after_break;
+extern bool tripping;
+extern bool good;
+extern tetra trace_threshold;
+extern mmix_opcode op;
+extern tetra f;
+extern int xx,yy,zz,yz;
+extern op_info info[256];
+extern int G,L,O;
+extern octa g[256];
+extern octa*l;
+extern int lring_size;
+extern int lring_mask;
+extern int S;
+extern char arg_count[];
+extern char*trap_format[];
+extern char stdin_buf[256];
+extern char*stdin_buf_start;
+extern char*stdin_buf_end;
+extern octa new_Q;
+extern bool showing_stats;
+extern bool just_traced;
+extern char left_paren[];
+extern char right_paren[];
+extern char switchable_string[300];
+extern char lhs[32];
+extern int good_guesses,bad_guesses;
+extern char*myself;
+extern char**cur_arg;
+extern bool interrupt;
+extern bool profiling;
+extern FILE*fake_stdin;
+extern FILE*dump_file;
+extern char*usage_help[];
+extern char*interactive_help[];
+extern char command_buf[];
+extern FILE*incl_file;
+extern char cur_disp_mode;
+extern char cur_disp_type;
+extern bool cur_disp_set;
+extern octa cur_disp_addr;
+extern octa cur_seg;
+extern char spec_reg_code[];
+extern char spec_regg_code[];
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