package/libmdbx: drop explicit _REDISTRIBUTE = YES

<pkg>_REDISTRIBUTE defaults to YES, so no need to explicitly set it.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit fbb3dcfc9dadecfba023ef3004a77470bfff61a3)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libmdbx/libmdbx.mk

@@ -10,7 +10,6 @@ LIBMDBX_SITE = https://libmdbx.dqdkfa.ru/release
 LIBMDBX_SUPPORTS_IN_SOURCE_BUILD = NO
 LIBMDBX_LICENSE = OLDAP-2.8
 LIBMDBX_LICENSE_FILES = LICENSE
-LIBMDBX_REDISTRIBUTE = YES
 LIBMDBX_STRIP_COMPONENTS = 0
 LIBMDBX_INSTALL_STAGING = YES