[gimp] GOI: add more introspected libraries as dependencies to ours.

[Jehan <jehanp src gnome org>]

commit c67fa791be82c47c0db47b3315f25c7253286aae
Author: Jehan <jehan girinstud io>
Date:   Sat Jul 27 23:29:41 2019 +0200

    GOI: add more introspected libraries as dependencies to ours.
    
    This fixes various "Unresolved type" warnings.

 Makefile.am | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/Makefile.am b/Makefile.am
index ee48048126..336b9b5f36 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -197,7 +197,16 @@ Gimp-@GIMP_API_VERSION@.gir: \
        libgimpthumb/libgimpthumb-@GIMP_API_VERSION@.la         \
        Makefile
 
-Gimp_@GIMP_API_MAJOR_VERSION@_@GIMP_API_MINOR_VERSION@_gir_INCLUDES = GObject-2.0 GLib-2.0
+# The various other GObject-Introspected libraries our API references
+# (i.e. types used in parameters or returned values).
+Gimp_@GIMP_API_MAJOR_VERSION@_@GIMP_API_MINOR_VERSION@_gir_INCLUDES = \
+       cairo-1.0       \
+       GdkPixbuf-2.0   \
+       Gegl-0.4        \
+       Gio-2.0         \
+       GLib-2.0        \
+       GObject-2.0
+
 Gimp_@GIMP_API_MAJOR_VERSION@_@GIMP_API_MINOR_VERSION@_gir_CFLAGS = \
        -DGIMP_COMPILATION              \
        -DGIMP_BASE_COMPILATION         \