vips: add giflib dependency

Add dependency to giflib as the buildbot complained about that.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

libs/vips/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=vips
 PKG_VERSION:=8.6.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/jcupitt/libvips/releases/download/v8.6.1/
@@ -29,7 +29,7 @@ define Package/vips
   TITLE:=An image manipulation library
   URL:=http://www.vips.ecs.soton.ac.uk/
   MAINTAINER:=W. Michael Petullo <mike@flyn.org>
-  DEPENDS:=+glib2 +libexif +libexpat +libjpeg +libpng +libstdcpp +libxml2 $(INTL_DEPENDS)
+  DEPENDS:=+glib2 +libexif +libexpat +libjpeg +libpng +giflib +libstdcpp +libxml2 $(INTL_DEPENDS)
 endef
 
 TARGET_LDFLAGS+= \