[glib] build: Add gio_probes.d to sources list so it ends up in the tarball

[Philip Withnall <pwithnall src gnome org>]

commit 8e21b9e966ae0cd72bfdb9b0b8e99b2dead9e0d7
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Wed Jun 22 12:41:34 2016 +0100

    build: Add gio_probes.d to sources list so it ends up in the tarball
    
    The probes.d file should be distributed even if GLib is build with
    dtrace disabled. This is what’s done in the glib and gobject
    directories.

 gio/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gio/Makefile.am b/gio/Makefile.am
index 18e0ca1..4e05b29 100644
--- a/gio/Makefile.am
+++ b/gio/Makefile.am
@@ -391,6 +391,7 @@ libgio_2_0_la_SOURCES =             \
        ginetsocketaddress.c    \
        ginitable.c             \
        ginputstream.c          \
+       gio_probes.d            \
        gio_trace.h             \
        gioenums.h              \
        gioerror.c              \