[tracker] tracker-extract: Fix warning in TIFF extractor

[Sam Thursfield <sthursfield src gnome org>]

commit 0b0e0c178a0ec71726f03e859ddbe8eaf5fd7b3e
Author: Sam Thursfield <sam afuera me uk>
Date:   Sat Mar 11 15:59:52 2017 +0000

    tracker-extract: Fix warning in TIFF extractor
    
    This uses code from libtracker-common, so it needs to include the
    header.

 src/tracker-extract/tracker-extract-tiff.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-tiff.c b/src/tracker-extract/tracker-extract-tiff.c
index d1c687d..64ff894 100644
--- a/src/tracker-extract/tracker-extract-tiff.c
+++ b/src/tracker-extract/tracker-extract-tiff.c
@@ -30,6 +30,7 @@
 #include <glib/gstdio.h>
 
 #include <tiffio.h>
+#include <libtracker-common/tracker-common.h>
 #include <libtracker-extract/tracker-extract.h>
 
 #define CM_TO_INCH          0.393700787