configure: Use LINKS loop for all build tree symlinks

A few places in configure were doing ad-hoc calls to
the symlink function to set up symlinks from the build tree
back to the source tree. We have a loop that does this
already for all files and directories listed in the LINKS
environment variable; use that instead.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

configure

@@ -7417,6 +7417,8 @@ LINKS="$LINKS pc-bios/s390-ccw/Makefile"
 LINKS="$LINKS roms/seabios/Makefile roms/vgabios/Makefile"
 LINKS="$LINKS pc-bios/qemu-icon.bmp"
 LINKS="$LINKS .gdbinit scripts" # scripts needed by relative path in .gdbinit
+LINKS="$LINKS tests/acceptance tests/data"
+LINKS="$LINKS tests/qemu-iotests/check"
 for bios_file in \
     $source_path/pc-bios/*.bin \
     $source_path/pc-bios/*.lid \
@@ -7453,25 +7455,13 @@ for rom in seabios vgabios ; do
     echo "RANLIB=$ranlib" >> $config_mak
 done
 
-# set up tests data directory
-for tests_subdir in acceptance data; do
-    if [ ! -e tests/$tests_subdir ]; then
-        symlink "$source_path/tests/$tests_subdir" tests/$tests_subdir
-    fi
-done
-
 # set up qemu-iotests in this build directory
 iotests_common_env="tests/qemu-iotests/common.env"
-iotests_check="tests/qemu-iotests/check"
 
 echo "# Automatically generated by configure - do not modify" > "$iotests_common_env"
 echo >> "$iotests_common_env"
 echo "export PYTHON='$python'" >> "$iotests_common_env"
 
-if [ ! -e "$iotests_check" ]; then
-    symlink "$source_path/$iotests_check" "$iotests_check"
-fi
-
 # Save the configure command line for later reuse.
 cat <<EOD >config.status
 #!/bin/sh