fdisk: fix trivial build failure

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/fdisk.c b/util-linux/fdisk.c
index 3f2e0d3..02785ab 100644
--- a/util-linux/fdisk.c
+++ b/util-linux/fdisk.c
@@ -662,6 +662,7 @@
 STATIC_OSF void xbsd_print_disklabel(int);
 #include "fdisk_osf.c"
 
+STATIC_GPT void gpt_list_table(int xtra);
 #include "fdisk_gpt.c"
 
 #if ENABLE_FEATURE_SGI_LABEL || ENABLE_FEATURE_SUN_LABEL