package/ccache: disable building tests

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit aa443e82513d6f094ecf89f97d34f877c49c8167)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ccache/ccache.mk

@@ -16,7 +16,8 @@ HOST_CCACHE_CONF_OPTS += \
 	-UCMAKE_C_COMPILER_LAUNCHER \
 	-UCMAKE_CXX_COMPILER_LAUNCHER \
 	-DZSTD_FROM_INTERNET=OFF \
-	-DHIREDIS_FROM_INTERNET=OFF
+	-DHIREDIS_FROM_INTERNET=OFF \
+	-DENABLE_TESTING=OFF
 
 # Patch host-ccache as follows:
 #  - Use BR_CACHE_DIR instead of CCACHE_DIR, because CCACHE_DIR