[gnome-characters] build: Fix VPATH build

[Daiki Ueno <dueno src gnome org>]

commit 7c6fb549cb384abb5a8582a36e829f295f1382bd
Author: Daiki Ueno <dueno src gnome org>
Date:   Mon Feb 23 16:11:25 2015 +0900

    build: Fix VPATH build
    
    When libunistring is missing or older, $(top_builddir)/gllib/uni*.h will
    be generated under.  This was causing problem when $(top_builddir) !=
    $(top_srcdir).

 lib/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/lib/Makefile.am b/lib/Makefile.am
index d287fb8..e4c436a 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -1,6 +1,7 @@
 AM_CPPFLAGS =                                  \
         -I$(top_srcdir)                                \
         -I$(top_srcdir)/gllib                  \
+        -I$(top_builddir)/gllib                        \
         -DPREFIX=\"$(prefix)\"                 \
         -DLIBDIR=\"$(libdir)\"                 \
         -DG_LOG_DOMAIN=\"libgc\"               \