fixed fuzzer32 to support multithreading tests
though it still fails on test33:
`test 33: superblock uncompressible data, too many nocompress superblocks`
diff --git a/tests/Makefile b/tests/Makefile
index a4521b6..83ebca9 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -152,7 +152,7 @@
fuzzer : $(ZSTDMT_OBJECTS)
fuzzer fuzzer32 : $(ZDICT_FILES) $(PRGDIR)/util.c $(PRGDIR)/timefn.c $(PRGDIR)/datagen.c fuzzer.c
-fuzzer32 : CFLAGS += -m32
+fuzzer32 : CFLAGS += -m32 $(MULTITHREAD)
fuzzer32 : $(ZSTD_FILES)
$(LINK.c) $^ -o $@$(EXT)