Revert "understand makefile.dj settings for compatibility"

This reverts commit 89c3efa.

This feeld a lot of clutter. Let's revisit this if there is an expressed
need for this.

lib/Makefile.mk

@@ -96,35 +96,6 @@ ifdef WATT_ROOT
   CFG += -watt
   WATT_PATH := $(realpath $(WATT_ROOT))
 endif
-ifneq ($(findstring 1,$(USE_OPENSSL)$(USE_SSL)),)
-  CFG += -ssl
-  OPENSSL_PATH := $(OPENSSL_ROOT)
-endif
-ifeq ($(USE_ZLIB),1)
-  CFG += -zlib
-  ZLIB_PATH := $(ZLIB_ROOT)
-endif
-ifeq ($(USE_IPV6),1)
-  CFG += -ipv6
-endif
-ifeq ($(USE_IDNA),1)
-  CFG += -idn2
-  LIBIDN2_PATH := $(LIBIDN_ROOT)
-  LIBS += -liconv
-endif
-ifeq ($(USE_ARES),1)
-  CFG += -ares
-  LIBCARES_PATH := $(ARES_ROOT)
-endif
-ifeq ($(USE_DEBUG),1)
-  CFG += -debug
-endif
-ifeq ($(USE_CURLDEBUG),1)
-  CFG += -trackmem
-endif
-ifeq ($(MAKE_MAP_FILE),1)
-  CFG += -map
-endif
 
 ### Optional features