Define kalistglobal only once, declare it globally

This fixes building with gcc and the -fno-common option. The
option is now added to compiler flags in full debugging mode.

katze/katze-array.c

@@ -65,6 +65,8 @@ enum {
 
 static guint signals[LAST_SIGNAL];
 
+GList* kalistglobal;
+
 static void
 katze_array_finalize (GObject* object);
 

katze/katze-array.h

@@ -83,7 +83,7 @@ katze_array_get_items              (KatzeArray*   array);
 GList*
 katze_array_peek_items             (KatzeArray*   array);
 
-GList* kalistglobal;
+extern GList* kalistglobal;
 #define KATZE_ARRAY_FOREACH_ITEM(kaitem, kaarray) \
     for (kalistglobal = katze_array_peek_items (kaarray), \
          kaitem = kalistglobal ? kalistglobal->data : NULL; \

wscript

@@ -308,7 +308,7 @@ def configure (conf):
                 '-Wno-missing-field-initializers '
                 '-Wredundant-decls -Wmissing-noreturn '
                 '-Wshadow -Wpointer-arith -Wcast-align '
-                '-Winline -Wformat-security '
+                '-Winline -Wformat-security -fno-common '
                 '-Winit-self -Wundef -Wdeclaration-after-statement '
                 '-Wmissing-format-attribute -Wnested-externs '
             # -DGSEAL_ENABLE