gimp: fix launch failure.

For some reason, gegl doesn't report the gegl:introspect operation as
available unless graphviz is installed. Since gegl:introspect isn't
necessarily required by other gegl dependants, add graphviz as a gimp
dependency instead.

Without this, if the user doesn't have graphviz installed, gimp will
fail to launch and complain that gegl doesn't support gegl:introspect.

srcpkgs/gimp/template

@@ -1,7 +1,7 @@
 # Template file for 'gimp'
 pkgname=gimp
 version=2.10.22
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--disable-check-update --datadir=/usr/share"
 hostmakedepends="automake gegl gettext-devel glib-devel gtk+-devel intltool
@@ -12,7 +12,8 @@ makedepends="aalib-devel alsa-lib-devel babl-devel dbus-glib-devel gegl-devel
  libopenexr-devel librsvg-devel libwmf-devel mypaint-brushes1
  poppler-glib-devel pygtk-devel glib-networking libwebp-devel
  libheif-devel libopenjpeg2-devel x265-devel"
-depends="desktop-file-utils hicolor-icon-theme iso-codes mypaint-brushes1"
+# graphviz is necessary to enable gegl:introspect
+depends="desktop-file-utils hicolor-icon-theme iso-codes mypaint-brushes1 graphviz"
 short_desc="GNU image manipulation program"
 conf_files="/etc/gimp/${version%%.*}.0/*"
 maintainer="fosslinux <fosslinux@aussies.space>"