libgimpwidgets: don't babl_init() in gimp_color_scale_class_init()

Woohoo!  We can actually inject this into the gtk-doc thingy!

devel-docs/libgimpwidgets/Makefile.am

@@ -10,7 +10,8 @@ DOC_MAIN_SGML_FILE = $(DOC_MODULE)-docs.sgml
 DOC_SOURCE_DIR = $(top_srcdir)/$(DOC_MODULE)
 
 # Extra options to pass to gtkdoc-scangobj
-SCANGOBJ_OPTIONS =
+# make sure babl is initialized, otherwise we segfault.
+SCANGOBJ_OPTIONS = --type-init-func="do { void babl_init (void); babl_init (); } while (0)"
 
 # Extra options to supply to gtkdoc-scan
 SCAN_OPTIONS = --deprecated-guards="GIMP_DISABLE_DEPRECATED"

libgimpwidgets/gimpcolorscale.c

@@ -154,13 +154,6 @@ gimp_color_scale_class_init (GimpColorScaleClass *klass)
 
   g_type_class_add_private (object_class, sizeof (GimpColorScalePrivate));
 
-  /*  This is so ugly... we have to babl_init() here so the binary
-   *  generated by gtk-doc to scan libgimpwidgets' types won't crash.
-   *  I didn't find a way to inject this line of code into the
-   *  generated source.
-   */
-  babl_init ();
-
   fish_rgb_to_lch = babl_fish (babl_format ("R'G'B'A double"),
                                babl_format ("CIE LCH(ab) double"));
   fish_lch_to_rgb = babl_fish (babl_format ("CIE LCH(ab) double"),