graphics/vips: Add IMAGEQUANT option

PR:		268908
Reported by:	jbeich

graphics/vips/Makefile

@@ -22,7 +22,6 @@ USE_GNOME=	glib20
 
 CONFIGURE_ARGS=	--disable-introspection \
 		--without-doxygen \
-		--without-imagequant \
 		--without-nifti \
 		--without-openslide \
 		--without-pdfium
@@ -33,11 +32,12 @@ PLIST_SUB=	VERSION=${PORTVERSION:R}
 
 SHEBANG_FILES=	tools/vips-${PORTVERSION:R} tools/vipsprofile
 
-OPTIONS_DEFINE=	CFITSIO DEBUG DOCS FFTW GIF GSF HEIF JPEG JXL LCMS2 LIBEXIF LIBRSVG2 MATIO OPENEXR ORC PANGO PNG POPPLER TIFF WEBP X11
+OPTIONS_DEFINE=	CFITSIO DEBUG DOCS FFTW GIF GSF HEIF IMAGEQUANT JPEG JXL LCMS2 LIBEXIF LIBRSVG2 MATIO OPENEXR ORC PANGO PNG POPPLER TIFF WEBP X11
 OPTIONS_RADIO=	MAGICK
 OPTIONS_RADIO_MAGICK=	IMAGEMAGICK GRAPHMAGICK
 OPTIONS_DEFAULT=CFITSIO FFTW GIF GSF HEIF IMAGEMAGICK JPEG JXL LCMS2 LIBEXIF LIBRSVG2 MATIO OPENEXR ORC PANGO PNG POPPLER TIFF WEBP X11
 GSF_DESC=	Structured file formats support
+IMAGEQUANT_DESC=Image Quantization support
 ORC_DESC=	ORC language support
 MATIO_DESC=	Matlab MAT format support
 
@@ -59,6 +59,8 @@ HEIF_CONFIGURE_WITH=	heif
 HEIF_LIB_DEPENDS=	libheif.so:graphics/libheif
 IMAGEMAGICK_CONFIGURE_ON=	--with-magickpackage=MagickCore
 IMAGEMAGICK_USES=	magick
+IMAGEQUANT_CONFIGURE_WITH=	imagequant
+IMAGEQUANT_LIB_DEPENDS=	libimagequant.so:graphics/libimagequant
 JPEG_CONFIGURE_WITH=	jpeg
 JPEG_LIB_DEPENDS=	libopenjp2.so:graphics/openjpeg
 JPEG_USES=		jpeg