Fix Clang error when using 'make tests'

When using 'make tests CC=clang', the following error is observed:
build/cache/test-cache.o: file not recognized: file format not recognized
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Adding $(LDFLAGS) resolves the issue, ensuring successful linking.

Author: eleanorLYJ

mk/tests.mk

@@ -83,7 +83,7 @@ $(CACHE_TEST_OUT): $(CACHE_TEST_TARGET)
 
 $(CACHE_TEST_TARGET): $(CACHE_TEST_OBJS)
 	$(VECHO) "  CC\t$@\n"
-	$(Q)$(CC) $^ -o $@
+	$(Q)$(CC) $^ -o $@ $(LDFLAGS)
 
 $(CACHE_TEST_OUTDIR)/%.o: $(CACHE_TEST_SRCDIR)/%.c
 	$(VECHO) "  CC\t$@\n"
@@ -95,7 +95,7 @@ $(MAP_TEST_OUT): $(MAP_TEST_TARGET)
 
 $(MAP_TEST_TARGET): $(MAP_TEST_OBJS)
 	$(VECHO) "  CC\t$@\n"
-	$(Q)$(CC) $^ -o $@
+	$(Q)$(CC) $^ -o $@ $(LDFLAGS)
 
 $(MAP_TEST_OUTDIR)/%.o: $(MAP_TEST_SRCDIR)/%.c
 	$(VECHO) "  CC\t$@\n"
@@ -107,7 +107,7 @@ $(PATH_TEST_OUT): $(PATH_TEST_TARGET)
 
 $(PATH_TEST_TARGET): $(PATH_TEST_OBJS)
 	$(VECHO) "  CC\t$@\n"
-	$(Q)$(CC) $^ -o $@
+	$(Q)$(CC) $^ -o $@ $(LDFLAGS)
 
 $(PATH_TEST_OUTDIR)/%.o: $(PATH_TEST_SRCDIR)/%.c
 	$(VECHO) "  CC\t$@\n"