tools: zstd: dont override CLI max level

Now that instead of relying on env variables for the GH download script
invoking ZSTD tarball compression it passes the full arguments via tar -I
we can drop the CLI max compression level override.

Signed-off-by: Robert Marko <robimarko@gmail.com>

tools/zstd/Makefile

@@ -17,9 +17,6 @@ include $(INCLUDE_DIR)/host-build.mk
 
 HOSTCC:= $(HOSTCC_NOCACHE)
 
-HOST_CFLAGS += \
-	-DZSTDCLI_CLEVEL_MAX=20
-
 HOST_MAKE_FLAGS += \
 	BACKTRACE=0 \
 	HAVE_THREAD=1 \