[network-manager-vpnc] Drop libsecret-unstable fallback

[Thomas Haller <thaller src gnome org>]

commit 8469ef7a4030549e7a6f548f91a5e6378f2f0683
Author: Michael Biebl <biebl debian org>
Date:   Mon May 15 07:25:48 2017 +0200

    Drop libsecret-unstable fallback
    
    Most of the libsecret API was declared stable in 0.18.
    This happened in 2014, over 3 years ago, so the fallback to
    libsecret-unstable is no longer necessary.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782639

 configure.ac |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 817d4da..bad9101 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,11 +91,7 @@ if test x"$with_gnome" != xno; then
        GTK_CFLAGS="$GTK_CFLAGS -DGDK_VERSION_MIN_REQUIRED=GDK_VERSION_3_4"
 
        PKG_CHECK_MODULES(LIBNMA, libnma >= 1.2.0)
-       PKG_CHECK_MODULES(LIBSECRET, libsecret-1 >= 0.18, [], [
-               dnl We use the secret service API that went stable in 0.18
-               PKG_CHECK_MODULES(LIBSECRET, libsecret-unstable)
-               LIBSECRET_CFLAGS="$LIBSECRET_CFLAGS -DSECRET_API_SUBJECT_TO_CHANGE"
-       ])
+       PKG_CHECK_MODULES(LIBSECRET, libsecret-1 >= 0.18)
 
        if test x"$with_libnm_glib" != xno; then
                PKG_CHECK_MODULES(LIBNM_GTK, libnm-gtk >= 1.2.0)