[gtk-vnc] build: add missing vncpixelformat.c file to introspection

[Daniel P. Berrange <dberrange src gnome org>]

commit c2f5f7504fff4cc84f4f2a3cc704348889b3a88b
Author: Daniel P. Berrangé <berrange redhat com>
Date:   Mon Aug 5 17:55:47 2019 +0100

    build: add missing vncpixelformat.c file to introspection
    
    Signed-off-by: Daniel P. Berrangé <berrange redhat com>

 src/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 5b29f0c..7e320f4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -304,7 +304,7 @@ INTROSPECTION_COMPILER_ARGS = --includedir=$(top_srcdir) \
 
 if HAVE_INTROSPECTION
 GVNC_INTROSPECTION_SRCS = \
-                       $(srcdir)/vncpixelformat.h \
+                       $(srcdir)/vncpixelformat.h $(srcdir)/vncpixelformat.c \
                        $(srcdir)/vncaudioformat.h $(srcdir)/vncaudioformat.c \
                        $(srcdir)/vncaudiosample.h $(srcdir)/vncaudiosample.c \
                        $(srcdir)/vncaudio.h $(srcdir)/vncaudio.c \