[easytag] Fix compilation if TagLib is not available

[David King <davidk src gnome org>]

commit ddf003b219799b82f4a72c7568fbcbe913e45f26
Author: David King <amigadave amigadave com>
Date:   Sun Apr 13 08:58:09 2014 +0100

    Fix compilation if TagLib is not available
    
    Thanks to Abhinav for the report.

 src/gio_wrapper.cc |    6 ++++++
 src/gio_wrapper.h  |    6 ++++++
 2 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/src/gio_wrapper.cc b/src/gio_wrapper.cc
index 9599494..569c0d5 100644
--- a/src/gio_wrapper.cc
+++ b/src/gio_wrapper.cc
@@ -17,6 +17,10 @@
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+#include "config.h"
+
+#ifdef ENABLE_MP4
+
 #include "gio_wrapper.h"
 
 GIO_InputStream::GIO_InputStream (GFile * file_) :
@@ -471,3 +475,5 @@ const GError *GIO_IOStream::getError () const
 {
     return error;
 }
+
+#endif /* ENABLE_MP4 */
diff --git a/src/gio_wrapper.h b/src/gio_wrapper.h
index dc6c9da..e49e54d 100644
--- a/src/gio_wrapper.h
+++ b/src/gio_wrapper.h
@@ -20,6 +20,10 @@
 #ifndef ET_GIO_WRAPPER_H_
 #define ET_GIO_WRAPPER_H_
 
+#include "config.h"
+
+#ifdef ENABLE_MP4
+
 #include <tiostream.h>
 #include <gio/gio.h>
 
@@ -79,4 +83,6 @@ private:
     GError *error;
 };
 
+#endif /* ENABLE_MP4 */
+
 #endif /* ET_GIO_WRAPPER_H_ */