Remove unnecessary extern statements.

command.c

@@ -24,7 +24,6 @@ extern int erase_char, erase2_char, kill_char;
 extern int sigs;
 extern int quit_if_one_screen;
 extern int one_screen;
-extern int squished;
 extern int sc_width;
 extern int sc_height;
 extern char *kent;
@@ -39,29 +38,23 @@ extern int hshift;
 extern int bs_mode;
 extern int proc_backspace;
 extern int show_attn;
-extern int status_col;
 extern POSITION highest_hilite;
-extern POSITION start_attnpos;
-extern POSITION end_attnpos;
 extern char *every_first_cmd;
 extern char version[];
 extern struct scrpos initial_scrpos;
 extern IFILE curr_ifile;
 extern void *ml_search;
 extern void *ml_examine;
 extern int wheel_lines;
-extern int header_lines;
 extern int def_search_type;
 extern int updown_match;
 #if SHELL_ESCAPE || PIPEC
 extern void *ml_shell;
 #endif
 #if EDITOR
-extern char *editor;
 extern char *editproto;
 #endif
 extern int shift_count;
-extern int oldbot;
 extern int forw_prompt;
 extern int incr_search;
 extern int full_screen;

edit.c

@@ -23,7 +23,6 @@
 public int fd0 = 0;
 
 extern int new_file;
-extern int cbufs;
 extern char *every_first_cmd;
 extern int force_open;
 extern int is_tty;

forwback.c

@@ -31,8 +31,6 @@ extern int plusoption;
 extern int forw_scroll;
 extern int back_scroll;
 extern int ignore_eoi;
-extern int clear_bg;
-extern int final_attr;
 extern int header_lines;
 extern int header_cols;
 extern int full_screen;

input.c

@@ -22,7 +22,6 @@
 extern int squeeze;
 extern int hshift;
 extern int quit_if_one_screen;
-extern int sigs;
 extern int ignore_eoi;
 extern int status_col;
 extern int wordwrap;

line.c

@@ -87,7 +87,6 @@ extern int proc_return;
 extern int linenums;
 extern int ctldisp;
 extern int twiddle;
-extern int binattr;
 extern int status_col;
 extern int status_col_width;
 extern int linenum_width;

main.c

@@ -57,7 +57,6 @@ public int one_screen;
 extern int less_is_more;
 extern int missing_cap;
 extern int know_dumb;
-extern int pr_type;
 extern int quit_if_one_screen;
 extern int no_init;
 extern int errmsgs;

optfunc.c

@@ -27,7 +27,6 @@
 #include "less.h"
 #include "option.h"
 
-extern int nbufs;
 extern int bufspace;
 extern int pr_type;
 extern int plusoption;
@@ -36,7 +35,6 @@ extern int sc_width;
 extern int sc_height;
 extern int secure;
 extern int dohelp;
-extern int is_tty;
 extern char openquote;
 extern char closequote;
 extern char *prproto[];
@@ -79,6 +77,7 @@ extern char ztags[];
 #endif
 #if LESSTEST
 extern char *ttyin_name;
+extern int is_tty;
 #endif /*LESSTEST*/
 #if MSDOS_COMPILER
 extern int nm_fg_color, nm_bg_color;

position.c

@@ -25,7 +25,6 @@ static POSITION *table = NULL; /* The position table */
 static int table_size = 0;
 
 extern int sc_width, sc_height;
-extern int header_lines;
 extern int hshift;
 
 /*

prompt.c

@@ -22,8 +22,6 @@
 
 extern int pr_type;
 extern int new_file;
-extern int sc_width;
-extern int so_s_width, so_e_width;
 extern int linenums;
 extern int hshift;
 extern int sc_height;

screen.c

@@ -279,11 +279,8 @@ char PC_, *UP, *BC;
 extern int quiet; /* If VERY_QUIET, use visual bell for bell */
 extern int no_vbell;
 extern int no_back_scroll;
-extern int swindow;
 extern int no_init;
 extern int no_keypad;
-extern int sigs;
-extern int wscroll;
 extern int top_scroll;
 extern int quit_if_one_screen;
 extern int oldbot;
@@ -294,6 +291,7 @@ extern int use_color;
 extern int hilite_search;
 #endif
 #if MSDOS_COMPILER==WIN32C
+extern int wscroll;
 extern HANDLE tty;
 extern DWORD console_mode;
 #ifndef ENABLE_EXTENDED_FLAGS

search.c

@@ -23,7 +23,6 @@ extern int sigs;
 extern int how_search;
 extern int caseless;
 extern int linenums;
-extern int sc_height;
 extern int jump_sline;
 extern int bs_mode;
 extern int proc_backspace;

signal.c

@@ -27,7 +27,6 @@
 public int sigs;
 
 extern int sc_width, sc_height;
-extern int lnloop;
 extern int linenums;
 extern int wscroll;
 extern int reading;

ttyin.c

@@ -31,9 +31,6 @@ public int tty;
 #if LESSTEST
 public char *ttyin_name = NULL;
 #endif /*LESSTEST*/
-extern int sigs;
-extern int utf_mode;
-extern int wheel_lines;
 
 #if !MSDOS_COMPILER
 static int open_tty_device(constant char* dev)