package/libevent: do not drop python script with python 3

python script is compatible with python3 since 2.1.10 and
https://github.com/libevent/libevent/commit/532a8cc301db39e82166b4fe98146534fdc242ce

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f0ec49f09b244598d1adde4a7f918d4d31050a42)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libevent/libevent.mk

@@ -24,7 +24,7 @@ endef
 
 # libevent installs a python script to target - get rid of it if we
 # don't have python support enabled
-ifneq ($(BR2_PACKAGE_PYTHON),y)
+ifneq ($(BR2_PACKAGE_PYTHON)$(BR2_PACKAGE_PYTHON3),y)
 LIBEVENT_POST_INSTALL_TARGET_HOOKS += LIBEVENT_REMOVE_PYSCRIPT
 endif