sqlcipher: specify tclConfig.sh directory

Otherwise it will search around, and if the host has it then it breaks.
Fixes:
http://autobuild.buildroot.net/results/057/0572a9a1f69ee214efb10863f5d2852b25bf4f54/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/sqlcipher/sqlcipher.mk

@@ -14,7 +14,8 @@ SQLCIPHER_CONF_ENV = \
 	TCLSH_CMD=$(HOST_DIR)/usr/bin/tclsh$(TCL_VERSION_MAJOR)
 
 SQLCIPHER_CONF_OPTS = \
-	--enable-threadsafe
+	--enable-threadsafe \
+	--with-tcl=$(HOST_DIR)/usr/lib
 
 SQLCIPHER_CFLAGS += -DSQLITE_HAS_CODEC # Required according to the README
 SQLCIPHER_CONF_ENV += LIBS="-lcrypto -lz"