dx: use version patched to work under Android 9 and higher

Fixes the issue described in https://www.reddit.com/r/termux/comments/ejrasu/java_on_my_s10_refuses_to_work/.

Android 9 and higher no longer provides JCA API - see https://developer.android.com/guide/topics/security/cryptography#crypto_provider.

packages/dx/build.sh

@@ -1,37 +1,35 @@
 TERMUX_PKG_HOMEPAGE=http://developer.android.com/tools/help/index.html
-TERMUX_PKG_DESCRIPTION="Command which takes in class files and reformulates them for usage on Android"
+TERMUX_PKG_DESCRIPTION="Command which takes in Java class files and converts them to format executable by Dalvik VM"
 TERMUX_PKG_LICENSE="Apache-2.0"
-TERMUX_PKG_VERSION=$TERMUX_ANDROID_BUILD_TOOLS_VERSION
+TERMUX_PKG_VERSION=1:1.16
+TERMUX_PKG_SRCURL=https://dl.bintray.com/xeffyr/sources/dx/dx-android-1.16.jar
+TERMUX_PKG_SHA256=b9b7917267876b74c8ff6707e7a576c93b6dfe8cacc4f1cc791d606bcbbb7bd5
 TERMUX_PKG_SKIP_SRC_EXTRACT=true
 TERMUX_PKG_PLATFORM_INDEPENDENT=true
 
 termux_step_make_install() {
-	# Rewrite packages to avoid using com.android.* classes which may clash with
-	# classes in the Android runtime on devices (see #1801):
-	local JARJAR=$TERMUX_PKG_CACHEDIR/jarjar.jar
-	local RULEFILE=$TERMUX_PKG_TMPDIR/jarjar-rule.txt
-	local REWRITTEN_DX=$TERMUX_PKG_TMPDIR/dx-rewritten.jar
-	termux_download \
-		http://central.maven.org/maven2/com/googlecode/jarjar/jarjar/1.3/jarjar-1.3.jar \
-		$JARJAR \
-		4225c8ee1bf3079c4b07c76fe03c3e28809a22204db6249c9417efa4f804b3a7
-	echo 'rule com.android.** dx.@1' > $RULEFILE
-	java -jar $JARJAR process $RULEFILE \
-		$ANDROID_HOME/build-tools/${TERMUX_PKG_VERSION}/lib/dx.jar \
-		$REWRITTEN_DX
+	termux_download "$TERMUX_PKG_SRCURL" \
+		"$TERMUX_PKG_CACHEDIR/dx-${TERMUX_PKG_VERSION:2}.jar" \
+		"$TERMUX_PKG_SHA256"
 
-	# Dex the rewritten jar file:
-	mkdir -p $TERMUX_PREFIX/share/dex
-	$TERMUX_D8 \
-		--release \
-		--min-api $TERMUX_PKG_API_LEVEL \
-		--output $TERMUX_PKG_TMPDIR \
-		$REWRITTEN_DX
+	install -Dm600 "$TERMUX_PKG_CACHEDIR/dx-${TERMUX_PKG_VERSION:2}.jar" \
+		"$TERMUX_PREFIX"/share/dex/dx.jar
 
-	cd $TERMUX_PKG_TMPDIR
-	jar cf dx.jar classes.dex
-	mv dx.jar $TERMUX_PREFIX/share/dex/dx.jar
+	cat <<- EOF > "$TERMUX_PREFIX"/bin/dx
+	#!${TERMUX_PREFIX}/bin/sh
+	exec dalvikvm \
+		-Xmx256m \
+		-cp ${TERMUX_PREFIX}/share/dex/dx.jar \
+		dx.dx.command.Main "\$@"
+	EOF
+	chmod 700 "$TERMUX_PREFIX"/bin/dx
 
-	install $TERMUX_PKG_BUILDER_DIR/dx $TERMUX_PREFIX/bin/dx
-	perl -p -i -e "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" $TERMUX_PREFIX/bin/dx
+	cat <<- EOF > "$TERMUX_PREFIX"/bin/dx-merge
+	#!${TERMUX_PREFIX}/bin/sh
+	exec dalvikvm \
+		-Xmx256m \
+		-cp ${TERMUX_PREFIX}/share/dex/dx.jar \
+		dx.dx.merge.DexMerger "\$@"
+	EOF
+	chmod 700 "$TERMUX_PREFIX"/bin/dx-merge
 }