build: drop the mktempd gnulib module

The mktempd module in gnulib provides an equivalent to 'mktemp -d' on
platforms which lack this shell command. All platforms on which libvirt
runs the affected tests have 'mktemp -d' support, so the gnulib module
is not required.
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

bootstrap.conf

@@ -71,7 +71,6 @@ mgetgroups
 mkdtemp
 mkostemp
 mkostemps
-mktempd
 net_if
 netdb
 nonblocking

tests/test-lib.sh

@@ -256,8 +256,7 @@ fi
 # a partition, or to undo any other global state changes.
 cleanup_() { :; }
 
-mktempd="$abs_top_srcdir/build-aux/mktempd"
-t_=$("$SHELL" "$mktempd" "$test_dir_" lv-$this_test.XXXXXXXXXX) \
+t_=$("mktemp" "-d" "$test_dir_/lv-$this_test.XXXXXXXXXX") \
     || error_ "failed to create temporary directory in $test_dir_"
 
 # Run each test from within a temporary sub-directory named after the