package/zlib-ng: disable tests

Tests are enabled by default and can be disabled since
https://github.com/zlib-ng/zlib-ng/commit/b0730d030a9ce5c53faa88bd8259c9afccce6881

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/zlib-ng/zlib-ng.mk

@@ -12,7 +12,11 @@ ZLIB_NG_INSTALL_STAGING = YES
 ZLIB_NG_PROVIDES = zlib
 
 # Build with zlib compatible API, gzFile support and optimizations on
-ZLIB_NG_CONF_OPTS += -DZLIB_COMPAT=1 -DWITH_GZFILEOP=1 -DWITH_OPTIM=1
+ZLIB_NG_CONF_OPTS += \
+	-DWITH_GZFILEOP=1 \
+	-DWITH_OPTIM=1 \
+	-DZLIB_COMPAT=1 \
+	-DZLIB_ENABLE_TESTS=OFF
 
 # Enable NEON and ACLE on ARM
 ifeq ($(BR2_arm),y)