[gtk+] build: Missing build flags

[Emmanuele Bassi <ebassi src gnome org>]

commit 02800033d45aad9ae7ebfe4b47c94828ea4b1b4a
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Jan 26 13:32:47 2016 +0000

    build: Missing build flags
    
    The compiler and linker flags variables were renamed in the previous
    commit.

 demos/gtk-demo/Makefile.am |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am
index 60e4e13..efd06b2 100644
--- a/demos/gtk-demo/Makefile.am
+++ b/demos/gtk-demo/Makefile.am
@@ -101,8 +101,8 @@ LDADDS = \
        -lm
 
 if BUILD_FONT_DEMO
-AM_CPPFLAGS += $(HARFBUZZ_CFLAGS)
-LDADDS += $(HARFBUZZ_LIBS)
+AM_CPPFLAGS += $(FONTDEMO_CFLAGS)
+LDADDS += $(FONTDEMO_LIBS)
 endif
 
 bin_PROGRAMS = gtk3-demo gtk3-demo-application