[gnome-multi-writer] build: Move gnome-multi-writer-probe to libexecdir

[Michael Biebl <mbiebl src gnome org>]

commit 47ff796d929070b07a6576f02e86ace71bb693d9
Author: Michael Biebl <biebl debian org>
Date:   Sun Sep 4 16:03:59 2016 +0200

    build: Move gnome-multi-writer-probe to libexecdir
    
    gnome-multi-writer-probe is a helper binary which is not supposed to be
    run directly by the user, so move it to libexecdir.

 configure.ac    |    1 +
 src/Makefile.am |    7 +++++--
 src/gmw-main.c  |    2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 298a61c..3c8d6e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -124,6 +124,7 @@ echo "
 
         prefix:                    ${prefix}
         datadir:                   ${datadir}
+        libexecdir:                ${libexecdir}
         compiler:                  ${CC}
         cflags:                    ${CFLAGS}
         cppflags:                  ${CPPFLAGS}
diff --git a/src/Makefile.am b/src/Makefile.am
index 756f99b..8084a1f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -9,10 +9,13 @@ AM_CPPFLAGS =                                         \
        $(UDISKS_CFLAGS)                                \
        -DG_LOG_DOMAIN=\"GnomeMultiWriter\"             \
        -DG_USB_API_IS_SUBJECT_TO_CHANGE                \
-       -DLOCALEDIR=\""$(localedir)"\"
+       -DLOCALEDIR=\""$(localedir)"\"                  \
+       -DLIBEXECDIR=\""$(libexecdir)"\"
+
+libexec_PROGRAMS =                                     \
+       gnome-multi-writer-probe
 
 bin_PROGRAMS =                                         \
-       gnome-multi-writer-probe                        \
        gnome-multi-writer
 
 gnome_multi_writer_LDADD =                             \
diff --git a/src/gmw-main.c b/src/gmw-main.c
index c824724..5aa7617 100644
--- a/src/gmw-main.c
+++ b/src/gmw-main.c
@@ -888,7 +888,7 @@ gmw_block_device_probe (const gchar *block_dev, GError **error)
        gint exit_status = 0;
        g_autofree gchar *standard_output = NULL;
        const gchar *argv[] = { "/usr/bin/pkexec",
-                               "/usr/bin/gnome-multi-writer-probe",
+                               LIBEXECDIR"/gnome-multi-writer-probe",
                                block_dev,
                                NULL };
        const gchar *envp[] = { NULL };