[gimp] libgimpthumb: do not scan gimpthumb-enums.c for introspection.

[Jehan <jehanp src gnome org>]

commit 7444b8eb9cf090132f722e9743b315b15600d9a3
Author: Jehan <jehan girinstud io>
Date:   Sun Jul 28 20:51:05 2019 +0200

    libgimpthumb: do not scan gimpthumb-enums.c for introspection.
    
    gimpthumb-enums.c is a built source from the header. No need to scan it.
    As a side effect, it fixes another build break as it could not recognize
    the construction rule for this file.
    Thanks to tmanni for raising these build issues.

 libgimpthumb/Makefile.am | 1 +
 libgimpthumb/Makefile.gi | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgimpthumb/Makefile.am b/libgimpthumb/Makefile.am
index 74df71d41f..36de1f776f 100644
--- a/libgimpthumb/Makefile.am
+++ b/libgimpthumb/Makefile.am
@@ -75,6 +75,7 @@ include $(top_srcdir)/libgimpthumb/Makefile.gi
 
 libgimpthumb_@GIMP_API_VERSION@_la_SOURCES = \
        gimpthumb.h             \
+       gimpthumb-enums.c       \
        $(libgimpthumb_introspectable)
 
 libgimpthumbinclude_HEADERS = \
diff --git a/libgimpthumb/Makefile.gi b/libgimpthumb/Makefile.gi
index ef144c60d0..b00e79719e 100644
--- a/libgimpthumb/Makefile.gi
+++ b/libgimpthumb/Makefile.gi
@@ -8,7 +8,6 @@ libgimpthumb_introspectable_headers =   \
        $(top_srcdir)/libgimpthumb/gimpthumbnail.h
 
 libgimpthumb_introspectable =  \
-       $(top_builddir)/libgimpthumb/gimpthumb-enums.c  \
        $(top_srcdir)/libgimpthumb/gimpthumb-error.c    \
        $(top_srcdir)/libgimpthumb/gimpthumb-utils.c    \
        $(top_srcdir)/libgimpthumb/gimpthumbnail.c      \