Fix definitions of global vars `confirm_quit` and `dir_process`

They were defined (rather than just declared) in .h files, when they
really should be defined in at most a single .c file.

Fixes #140.

src/browser.h

@@ -28,7 +28,6 @@
 
 #include "global.h"
 
-int  confirm_quit;
 int  browse_key(int);
 void browse_draw(void);
 void browse_init(struct dir *);

src/dir.h

@@ -103,7 +103,7 @@ int dir_export_init(const char *fn);
 
 
 /* Function set by input code. Returns dir_output.final(). */
-int (*dir_process)();
+extern int (*dir_process)();
 
 /* Scanning a live directory */
 extern int dir_scan_smfs;

src/dir_common.c

@@ -31,6 +31,7 @@
 #include <stdarg.h>
 
 
+int (*dir_process)();
 char *dir_curpath;   /* Full path of the last seen item. */
 struct dir_output dir_output;
 char *dir_fatalerr; /* Error message on a fatal error. (NULL if there was no fatal error) */

src/main.c

@@ -42,6 +42,7 @@ long update_delay = 100;
 int cachedir_tags = 0;
 int extended_info = 0;
 int follow_symlinks = 0;
+int confirm_quit = 0;
 
 static int min_rows = 17, min_cols = 60;
 static int ncurses_init = 0;