Remove unused variables

Global variable keyhandler is declared as pointer to incomplete struct
type. Upon closer inspection, it turned out that this variable and
client_handles_keys are unused.

debian/patches/08-remove-unused-variables.diff

@@ -0,0 +1,44 @@
+Description: Remove unused variables
+ Global variable keyhandler is declared as pointer to incomplete struct type.
+ Upon closer inspection, it turned out that this variable and
+ client_handles_keys are unused.
+Author: Alexander Ponyatykh <lazyranma@gmail.com>
+Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=688465
+Last-Update: 2019-11-18
+===================================================================
+--- a/g15daemon/linked_lists.c
++++ b/g15daemon/linked_lists.c
+@@ -30,8 +30,6 @@
+ #include <g15daemon.h>
+ #include <libg15.h>
+ 
+-extern lcd_t *keyhandler;
+-extern unsigned int client_handles_keys;
+ extern plugin_info_t *generic_info;
+ 
+ lcd_t static * ll_create_lcd () {
+@@ -175,12 +173,6 @@
+         (*masterlist)->current->lcd->state_changed = 1;
+     }
+     
+-    if(&oldnode->lcd == (void*)keyhandler) {
+-        client_handles_keys = 0;
+-        keyhandler = NULL;
+-        g15daemon_log(LOG_WARNING,"Client key handler quit, going back to defaults");
+-    }
+-    
+     if((*masterlist)->head!=oldnode){
+         (*next)->prev = oldnode->prev;
+         (*prev)->next = oldnode->next;
+--- a/g15daemon/main.c
++++ b/g15daemon/main.c
+@@ -53,9 +53,7 @@
+ int keyboard_backlight_off_onexit = 0;
+ unsigned int g15daemon_debug = 0;
+ unsigned int cycle_key;
+-unsigned int client_handles_keys = 0;
+ static unsigned int set_backlight = 0;
+-struct lcd_t *keyhandler = NULL;
+ 
+ static int loaded_plugins = 0;
+