tweaks: move declaration of variable that does not need to be global

More importantly: searching in src/history.c will now not only find
the uses of 'position_history' but also its declaration.

src/global.c

@@ -216,9 +216,6 @@ filestruct *replacebot = NULL;
 
 filestruct *executetop = NULL;
 filestruct *executebot = NULL;
-
-poshiststruct *position_history = NULL;
-		/* The list of filenames with their last cursor positions. */
 #endif
 
 regex_t search_regexp;

src/history.c

@@ -40,6 +40,8 @@ static struct stat stat_of_positions_file;
 		/* The last-obtained stat information of the positions file. */
 static char *poshistname = NULL;
 		/* The name of the positions-history file. */
+static poshiststruct *position_history = NULL;
+		/* The list of filenames with their last cursor positions. */
 
 /* Initialize the lists of historical search and replace strings
  * and the list of historical executed commands. */

src/proto.h

@@ -154,7 +154,6 @@ extern filestruct *replacetop;
 extern filestruct *replacebot;
 extern filestruct *executetop;
 extern filestruct *executebot;
-extern poshiststruct *position_history;
 #endif
 
 extern regex_t search_regexp;