Build: Don't build a libfips202.a

The FIPS-202 code in mlkem-native is not meant as a standalone library;
instead, it only provides the minimal functionality needed to implement
ML-KEM. As such, it should not be generated as a separate library, but
directly linked into the libmlkem{XXX}.a.

This commit adjusts the build accordingly.

Signed-off-by: Hanno Becker <[email protected]>

mk/crypto.mk

@@ -5,18 +5,7 @@ ifeq ($(OPT),1)
 	FIPS202_SRCS += $(wildcard fips202/native/aarch64/*.S) $(wildcard fips202/native/x86_64/xkcp/*.c)
 endif
 
-$(BUILD_DIR)/libfips202.a: $(call OBJS, $(FIPS202_SRCS))
 $(BUILD_DIR)/libmlkem.a: $(call OBJS, $(FIPS202_SRCS))
-
-# all lib<scheme>.a depends on libfips202.a
-define ADD_FIPS202
-$(BUILD_DIR)/lib$(1).a: LDLIBS += -lfips202
-# NOTE:
-# - Merging multiple .a files with ar is more complex than building a single library directly from all the object files (.o). Hence, all .o files are added as dependencies here.
-
-$(BUILD_DIR)/lib$(1).a: $(BUILD_DIR)/libfips202.a $(call OBJS, $(FIPS202_SRCS))
-endef
-
-$(foreach scheme,mlkem512 mlkem768 mlkem1024, \
-	$(eval $(call ADD_FIPS202,$(scheme))) \
-)
+$(BUILD_DIR)/libmlkem512.a: $(call OBJS, $(FIPS202_SRCS))
+$(BUILD_DIR)/libmlkem768.a: $(call OBJS, $(FIPS202_SRCS))
+$(BUILD_DIR)/libmlkem1024.a: $(call OBJS, $(FIPS202_SRCS))