sysvinit: make sure to link against libcrypt

sysvinit Makefile checks if /usr/lib/libcrypt.a exists to determine
whether it should link against libcrypt or not. This test fails on
distributions such as Fedora, in which /usr/lib/libcrypt.a does not
exist (it is in /usr/lib64), but where libcrypt is available on the
target. As libcrypt is available in both uClibc and gclibc, we just
force sysvinit to link against libcrypt.

Fixes bug #2401.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/sysvinit/sysvinit.mk

@@ -21,7 +21,9 @@ $(SYSVINIT_DIR)/.unpacked: $(DL_DIR)/$(SYSVINIT_SOURCE)
 	touch $@
 
 $(SYSVINIT_DIR)/$(SYSVINIT_BINARY): $(SYSVINIT_DIR)/.unpacked
-	CFLAGS="$(TARGET_CFLAGS)" $(MAKE) CC="$(TARGET_CC)" -C $(SYSVINIT_DIR)/src
+	# Force sysvinit to link against libcrypt as it otherwise
+	# use an incorrect test to see if it's available
+	CFLAGS="$(TARGET_CFLAGS)" $(MAKE) CC="$(TARGET_CC)" LCRYPT="-lcrypt" -C $(SYSVINIT_DIR)/src
 
 $(TARGET_DIR)/$(SYSVINIT_TARGET_BINARY): $(SYSVINIT_DIR)/$(SYSVINIT_BINARY)
 	for x in halt init shutdown; do \