powerpc: fix iflag build issue (static -> extern)

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
diff --git a/defs.h b/defs.h
index 64cfc8d..6e0bd88 100644
--- a/defs.h
+++ b/defs.h
@@ -550,6 +550,7 @@
 extern cflag_t cflag;
 extern bool debug_flag;
 extern bool Tflag;
+extern bool iflag;
 extern unsigned int qflag;
 extern bool not_failing_only;
 extern bool show_fd_path;