graphics/jasper: re-add 'experimental' to HEIF description

Reported by:	mandree
Approved by:	sunpoet

graphics/jasper/Makefile

@@ -30,6 +30,7 @@ OPTIONS_SUB=	yes
 
 HEIF_CMAKE_BOOL=	JAS_ENABLE_HEIC_CODEC JAS_ENABLE_LIBHEIF JAS_INCLUDE_HEIC_CODEC
 HEIF_LIB_DEPENDS=	libheif.so:graphics/libheif
+HEIF_DESC=		ISO/IEC 23008-12:2017 HEIF file format support (experimental)
 OPENGL_CMAKE_BOOL=	JAS_ENABLE_OPENGL
 OPENGL_USE=		GL=gl,glu,glut XORG=x11,xext,xi,xmu
 OPENGL_USES=		gl xorg