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

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/3169a6a7ada17e2ea8ef4641edee68134c04b92b

commit 3169a6a7ada17e2ea8ef4641edee68134c04b92b
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>
---
 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 48d9457..be4b967 100644
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -112,10 +112,10 @@ 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