samba4: fix build with parallel jobs

* fixes openwrt/packages#8721

Signed-off-by: Andy Walsh <andy.walsh44+github@gmail.com>

net/samba4/Makefile

@@ -3,7 +3,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=samba
 PKG_VERSION:=4.9.6
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_MAINTAINER:=Andy Walsh <andy.walsh44+github@gmail.com>
 PKG_LICENSE:=GPL-3.0-only
@@ -19,7 +19,8 @@ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_HASH:=c9205a651a83d69e200fec9dd65e9fa360f0c75ab3275b3dcb74e5cbaec60807
 
 # samba4=(asn1_compile) e2fsprogs=(compile_et) nfs-kernel-server=(rpcgen)
-PKG_BUILD_DEPENDS:=samba4/host e2fsprogs/host nfs-kernel-server/host 
+HOST_BUILD_DEPENDS:=nfs-kernel-server/host e2fsprogs/host
+PKG_BUILD_DEPENDS:=samba4/host
 
 PKG_CONFIG_DEPENDS:= \
 	CONFIG_SAMBA4_SERVER_NETBIOS \