Python: Fix SWIG includes to pass make distcheck
diff --git a/swig/Makefile.am b/swig/Makefile.am
index 0953a56..8c1f2b9 100644
--- a/swig/Makefile.am
+++ b/swig/Makefile.am
@@ -1,4 +1,4 @@
-AM_CPPFLAGS = -I$(top_srcdir)/include  $(libplist_CFLAGS) $(SWIG_PYTHON_CPPFLAGS) -I$(oldincludedir)
+AM_CPPFLAGS = -I$(top_srcdir)/include $(libglib2_CFLAGS) $(libplist_CFLAGS) $(SWIG_PYTHON_CPPFLAGS) -I$(oldincludedir)
 
 if HAVE_SWIG
 BUILT_SOURCES = imobiledevice_wrap.cxx