[source] busybox: fix installation of cron and ntpd scripts in the default config

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/94597229c3ad7b1f834c4f352ade66466d384560

commit 94597229c3ad7b1f834c4f352ade66466d384560
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Tue Apr 4 15:05:11 2017 +0200

    busybox: fix installation of cron and ntpd scripts in the default config
    
    Fixes: 0b24850e9778 ("busybox: don't install NTP scripts if NTP isn't configured")
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
    (cherry picked from commit 3169a6a7ada17e2ea8ef4641edee68134c04b92b)
---
 package/utils/busybox/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile
index 6463dc0..0d37086 100644
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -118,10 +118,10 @@ endef
 define Package/busybox/install
 	$(INSTALL_DIR) $(1)/etc/init.d
 	$(CP) $(PKG_INSTALL_DIR)/* $(1)/
-ifneq ($(CONFIG_BUSYBOX_CONFIG_CROND),)
+ifneq ($(CONFIG_BUSYBOX_$(BUSYBOX_SYM)_CROND),)
 	$(INSTALL_BIN) ./files/cron $(1)/etc/init.d/cron
 endif
-ifneq ($(CONFIG_BUSYBOX_CONFIG_NTPD),)
+ifneq ($(CONFIG_BUSYBOX_$(BUSYBOX_SYM)_NTPD),)
 	$(INSTALL_BIN) ./files/sysntpd $(1)/etc/init.d/sysntpd
 	$(INSTALL_BIN) ./files/ntpd-hotplug $(1)/usr/sbin/ntpd-hotplug
 endif