scripts/properties.sh: set java home to openjdk 8

Fix packages like termux-am

packages/openjdk-17/build.sh

@@ -13,6 +13,8 @@ TERMUX_PKG_BUILD_IN_SRC=true
 TERMUX_PKG_HAS_DEBUG=false
 
 termux_step_pre_configure() {
+	unset JAVA_HOME
+
 	# Provide fake gcc.
 	mkdir -p $TERMUX_PKG_SRCDIR/wrappers-bin
 	cat <<- EOF > $TERMUX_PKG_SRCDIR/wrappers-bin/android-wrapped-clang

scripts/properties.sh

@@ -3,6 +3,8 @@ TERMUX_NDK_VERSION_NUM=21
 TERMUX_NDK_REVISION="d"
 TERMUX_NDK_VERSION=$TERMUX_NDK_VERSION_NUM$TERMUX_NDK_REVISION
 
+export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+
 if [ "${TERMUX_PACKAGES_OFFLINE-false}" = "true" ]; then
 	export ANDROID_HOME=${TERMUX_SCRIPTDIR}/build-tools/android-sdk
 	export NDK=${TERMUX_SCRIPTDIR}/build-tools/android-ndk

scripts/setup-android-sdk.sh

@@ -4,8 +4,6 @@ set -e -u
 # Install desired parts of the Android SDK:
 . $(cd "$(dirname "$0")"; pwd)/properties.sh
 
-export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
-
 ANDROID_SDK_FILE=sdk-tools-linux-4333796.zip
 ANDROID_SDK_SHA256=92ffee5a1d98d856634e8b71132e8a95d96c83a63fde1099be3d86df3106def9
 ANDROID_NDK_FILE=android-ndk-r${TERMUX_NDK_VERSION}-Linux-x86_64.zip