[tracker] build: Drop obsolete warning about seccomp

[Michael Biebl <mbiebl src gnome org>]

commit eba71ba073ca495c71b2fab8d45fa1501fcb819e
Author: Michael Biebl <biebl debian org>
Date:   Thu Aug 31 11:01:14 2017 +0200

    build: Drop obsolete warning about seccomp
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787057

 configure.ac |    6 ------
 1 files changed, 0 insertions(+), 6 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d36a101..9bf42ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1081,9 +1081,3 @@ WARNING:
 
 "
 fi
-
-if test "$have_libseccomp" = "no"; then
-echo "
-WARNING: libseccomp was not found, build will not be prevented, but this is a security flaw.
-"
-fi