[tracker] build: Drop obsolete _REQUIRED versions

[Michael Biebl <mbiebl src gnome org>]

commit c1ed1194c14d3d26c3ee7ed30f20dab42c2539ef
Author: Michael Biebl <biebl debian org>
Date:   Thu Aug 31 11:08:24 2017 +0200

    build: Drop obsolete _REQUIRED versions

 configure.ac |   21 ---------------------
 1 files changed, 0 insertions(+), 21 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9bf42ae..32c0fa9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -209,31 +209,10 @@ PYTHON_REQUIRED=2.6
 # Library required versions
 DBUS_REQUIRED=1.3.1
 GLIB_REQUIRED=2.44.0
-GTK_REQUIRED=3.0.0
 LIBXML2_REQUIRED=2.6
 HAL_REQUIRED=0.5
 UPOWER_REQUIRED=0.9.0
-POPPLER_REQUIRED=0.16.0
-CAIRO_REQUIRED=1.0
 LIBICU_REQUIRED=4.8.1.1
-LIBJPEG_REQUIRED="any version"
-LIBGIF_REQUIRED="any version"
-LIBTIFF_REQUIRED="any version"
-LIBVORBIS_REQUIRED=0.22
-LIBFLAC_REQUIRED=1.2.1
-LIBEXIF_REQUIRED=0.6
-LIBGSF_REQUIRED=1.14.24
-LIBOSINFO_REQUIRED=0.2.9
-EXEMPI_REQUIRED=2.1.0
-EVO_REQUIRED=2.32.0
-EVO_SHELL_REQUIRED=2.32.0
-EDS_REQUIRED=2.32.0
-CAMEL_REQUIRED=2.32.0
-TAGLIB_REQUIRED=1.6
-LIBGRSS_REQUIRED=0.7
-GSTREAMER_REQUIRED=0.10.31
-GUPNP_DLNA_REQUIRED=0.9.4
-LIBPNG_REQUIRED=1.2
 JSON_GLIB_REQUIRED=1.0
 LIBSOUP_REQUIRED=2.40