[gegl] build: use top-builddir for argvs-commands.inc path

[Øyvind "pippin" Kolås <ok src gnome org>]

commit bdc4cfc3ed566454aa547855e43105ca3663441e
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Jan 16 17:15:51 2019 +0100

    build: use top-builddir for argvs-commands.inc path

 bin/Makefile.am | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/bin/Makefile.am b/bin/Makefile.am
index 723fe7e6f..6af9322cf 100644
--- a/bin/Makefile.am
+++ b/bin/Makefile.am
@@ -4,6 +4,7 @@ endif
 
 AM_CPPFLAGS = \
        -I$(top_srcdir) \
+       -I$(top_builddir)/bin \
        -I$(top_builddir)/gegl \
        -I$(top_srcdir)/gegl \
        -I$(top_builddir)/gegl/buffer \
@@ -47,7 +48,7 @@ gegl_SOURCES =                        \
 
 argvs-commands.inc: gegl.c ui.c argvs.c Makefile
        @echo " GEN" $@
-       @$(top_srcdir)/tools/argvs_extract.sh $(top_srcdir)/bin/*.c > argvs-commands.inc
+       @$(top_srcdir)/tools/argvs_extract.sh $(top_srcdir)/bin/*.c > $(top_builddir)/bin/argvs-commands.inc
 
 if HAVE_MRG
 if HAVE_GEXIV2