[gnome-flashback] gvc: fix builddir != srcdir

[Alberts Muktupāvels <muktupavels src gnome org>]

commit b3aa1bd049a0c02270e9c10c1a5e8f4b084396dc
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 25 21:40:54 2020 +0300

    gvc: fix builddir != srcdir

 gvc/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gvc/Makefile.am b/gvc/Makefile.am
index ee7e3ff..f9f42bb 100644
--- a/gvc/Makefile.am
+++ b/gvc/Makefile.am
@@ -96,7 +96,7 @@ test_audio_device_selection_LDADD = \
 endif
 
 ENUM_TYPES = \
-       gvc/gvc-mixer-stream.h \
+       $(srcdir)/gvc/gvc-mixer-stream.h \
        $(NULL)
 
 gvc-enum-types.c: gvc-enum-types.c.in gvc-enum-types.h $(ENUM_TYPES)