Update repology metadata generation

Fix empty dx version and write out empty depends array.

scripts/generate-repology-metadata.sh

@@ -13,7 +13,6 @@ check_package() { # path
 	echo "    \"description\": \"$DESC\","
 	echo "    \"homepage\": \"$TERMUX_PKG_HOMEPAGE\","
 
-	if [ "$TERMUX_PKG_DEPENDS" != "" ]; then
 	echo -n "    \"depends\": ["
 	FIRST_DEP=yes
 	for p in ${TERMUX_PKG_DEPENDS//,/ }; do
@@ -25,7 +24,6 @@ check_package() { # path
 		echo -n "\"$p\""
 	done
 	echo "],"
-	fi
 
 	if [ "$TERMUX_PKG_SRCURL" != "" ]; then
 		echo "    \"srcurl\": \"$TERMUX_PKG_SRCURL\","
@@ -37,6 +35,7 @@ check_package() { # path
 
 export TERMUX_ARCH=aarch64
 export TERMUX_NDK_VERSION=17
+TERMUX_ANDROID_BUILD_TOOLS_VERSION=27.0.3
 
 echo '['