meson: Add Autotools changes that weren't mirrored

commits:
a7d282d27256ad1d1a55afc37d1db7f60b040089
6fdb4df0f8c8a9e39f7f7cb73ab65306fb0517f5
1aceebd67f0161806dc3b4b68488d599290f283e

gst/meson.build

@@ -11,7 +11,6 @@ gst_sources = [
   'gstcapsfeatures.c',
   'gstchildproxy.c',
   'gstclock.c',
-  'gstclock-linreg.c',
   'gstcontext.c',
   'gstcontrolbinding.c',
   'gstcontrolsource.c',

plugins/elements/meson.build

@@ -1,6 +1,7 @@
 gst_elements_sources = [
   'gstcapsfilter.c',
   'gstconcat.c',
+  'gstdataurisrc.c',
   'gstdownloadbuffer.c',
   'gstelements.c',
   'gstelements_private.c',

tests/check/meson.build

@@ -77,6 +77,7 @@ core_tests = [
   [ 'libs/queuearray.c' ],
   [ 'elements/capsfilter.c', not have_registry ],
   [ 'elements/concat.c', not have_registry ],
+  [ 'elements/dataurisrc.c', not have_registry ],
   [ 'elements/fakesrc.c', not have_registry ],
   [ 'elements/fdsrc.c', not have_registry ],
   [ 'elements/filesink.c', not have_registry ],