package/empty: bump to version 0.6.21b

Tarball is now without a leading directory component. Don't strip
leading patch component.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/empty/empty.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256  7e6636e400856984c4405ce7bd0843aaa3329fa3efd20c58df8400a9eaa35f09  empty-0.6.20b.tgz
+sha256  2fccd0faa1b3deaec1add679cbde3f34250e45872ad5df463badd4bb4edeb797  empty-0.6.21b.tgz
 sha256  f01dbe3c624084900b9df1393d9062518b2bc0487acd6a3300ebd6e71352d112  COPYRIGHT

package/empty/empty.mk

@@ -4,11 +4,12 @@
 #
 ################################################################################
 
-EMPTY_VERSION = 0.6.20b
+EMPTY_VERSION = 0.6.21b
 EMPTY_SOURCE = empty-$(EMPTY_VERSION).tgz
 EMPTY_SITE = http://downloads.sourceforge.net/project/empty/empty/empty-$(EMPTY_VERSION)
 EMPTY_LICENSE = BSD-3-Clause
 EMPTY_LICENSE_FILES = COPYRIGHT
+EMPTY_STRIP_COMPONENTS = 0
 
 define EMPTY_BUILD_CMDS
 	$(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D) all