configure: remove DIRS

DIRS is used to create the directory in which the LINKS symbolic links
reside, or to create directories for object files.  The former can
be done directly in the symlinking loop, while the latter is done
by Meson already, so DIRS is not necessary.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -3762,7 +3762,6 @@ if test "$safe_stack" = "yes"; then
 fi
 
 # If we're using a separate build tree, set it up now.
-# DIRS are directories which we simply mkdir in the build tree;
 # LINKS are things to symlink back into the source tree
 # (these can be both files and directories).
 # Caution: do not add files or directories here using wildcards. This
@@ -3774,12 +3773,6 @@ fi
 # UNLINK is used to remove symlinks from older development versions
 # that might get into the way when doing "git update" without doing
 # a "make distclean" in between.
-DIRS="tests tests/tcg tests/qapi-schema tests/qtest/libqos"
-DIRS="$DIRS tests/qtest tests/qemu-iotests tests/vm tests/fp tests/qgraph"
-DIRS="$DIRS docs docs/interop fsdev scsi"
-DIRS="$DIRS pc-bios/optionrom pc-bios/s390-ccw"
-DIRS="$DIRS roms/seabios"
-DIRS="$DIRS contrib/plugins/"
 LINKS="Makefile"
 LINKS="$LINKS tests/tcg/Makefile.target"
 LINKS="$LINKS pc-bios/optionrom/Makefile"
@@ -3807,9 +3800,9 @@ for bios_file in \
 do
     LINKS="$LINKS pc-bios/$(basename $bios_file)"
 done
-mkdir -p $DIRS
 for f in $LINKS ; do
     if [ -e "$source_path/$f" ]; then
+        mkdir -p `dirname ./$f`
         symlink "$source_path/$f" "$f"
     fi
 done