configure: Copy test data to build directory

The QDict unit-tests (check-qdict) will fail when ran on a different
build directory. That's, it only works when ran on the source dir.

This happens because its data file (qdict-test-data.txt) is not
copied to the build dir. Fix it.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

configure

diff --git a/configure b/configure
index c3044c7..fe3147b 100755
--- a/configure
+++ b/configure
@@ -3614,7 +3614,7 @@
 DIRS="$DIRS fsdev ui"
 DIRS="$DIRS qapi"
 DIRS="$DIRS qga trace"
-FILES="Makefile tests/Makefile"
+FILES="Makefile tests/Makefile qdict-test-data.txt"
 FILES="$FILES tests/cris/Makefile tests/cris/.gdbinit"
 FILES="$FILES pc-bios/optionrom/Makefile pc-bios/keymaps"
 FILES="$FILES pc-bios/spapr-rtas/Makefile"