rsync: update dependencies for rrsync

- update dependencies from perl to python
- support dropbear

Signed-off-by: Maxim Storchak <m.storchak@gmail.com>
(cherry picked from commit b0a6a9147b)

net/rsync/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rsync
 PKG_VERSION:=3.4.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://download.samba.org/pub/$(PKG_NAME)/src
@@ -76,7 +76,7 @@ define Package/rrsync
   CATEGORY:=Network
   SUBMENU:=File Transfer
   TITLE:=Restricted rsync script
-  DEPENDS:=+rsync +perlbase-file +perl @(PACKAGE_openssh-server||PACKAGE_openssh-server-pam)
+  DEPENDS:=+rsync python3-light @(PACKAGE_openssh-server||PACKAGE_openssh-server-pam||(PACKAGE_dropbear&&DROPBEAR_SVR_PUBKEY_OPTIONS))
   URL:=https://www.samba.org/ftp/unpacked/rsync/support/rrsync
 endef