libgd: fix missing dependency, add build options

libgd fails to build due to missing dependency if the libtiff
package is selected. Fix the build issue and add two new
configuration options, both disabled by default:
1) enable TIFF support, and
2) enable Freetype 2.x support.

Signed-off-by: Val Kulkov <val.kulkov@gmail.com>

libs/libgd/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libgd
 PKG_VERSION:=2.2.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://github.com/$(PKG_NAME)/$(PKG_NAME)/releases/download/gd-$(PKG_VERSION)/
@@ -27,9 +27,10 @@ include $(INCLUDE_DIR)/package.mk
 define Package/libgd
   SECTION:=libs
   CATEGORY:=Libraries
-  DEPENDS:=+libjpeg +libpng
+  DEPENDS:=+libjpeg +libpng +LIBGD_TIFF:libtiff +LIBGD_FREETYPE:libfreetype
   TITLE:=The GD graphics library
   URL:=http://www.libgd.org/
+  MENU:=1
 endef
 
 define Package/libgd/description
@@ -37,6 +38,23 @@ define Package/libgd/description
   programmers. GD creates PNG, JPEG and GIF images, among other formats.
 endef
 
+define Package/libgd/config
+	if PACKAGE_libgd
+		config LIBGD_TIFF
+			bool "TIFF image support"
+			default n
+			help
+				Enable TIFF image support through libtiff
+	endif
+	if PACKAGE_libgd
+		config LIBGD_FREETYPE
+			bool "Freetype 2.x library support"
+			default n
+			help
+				Enable Freetype 2.x font engine support through libfreetype
+	endif
+endef
+
 TARGET_CFLAGS += $(FPIC)
 
 CONFIGURE_ARGS += \
@@ -45,12 +63,25 @@ CONFIGURE_ARGS += \
 	--disable-rpath \
 	--without-x \
 	--without-fontconfig \
-	--without-freetype \
 	--with-jpeg=$(STAGING_DIR)/usr \
 	--with-png=$(STAGING_DIR)/usr \
-	--with-vpx=no \
-	--without-xpm \
-	--without-iconv
+	--without-xpm
+
+ifdef CONFIG_LIBGD_TIFF
+	CONFIGURE_ARGS+= \
+		--with-tiff=$(STAGING_DIR)/usr
+else
+	CONFIGURE_ARGS+= \
+		--without-tiff
+endif
+
+ifdef CONFIG_LIBGD_FREETYPE
+	CONFIGURE_ARGS+= \
+		--with-freetype=$(STAGING_DIR)/usr
+else
+	CONFIGURE_ARGS+= \
+		--without-freetype
+endif
 
 CONFIGURE_VARS += \
 	ac_cv_header_iconv_h=no