Android: replace ndk.dir with android.ndkVersion in build.gradle

The use of ndk.dir in local.properties is deprecated in favor of
android.ndkVersion in build.gradle, and will be totatlly removed in
the future, so we need to adapt to that.

Fixes: QTBUG-91391
Change-Id: I54c57113a759d43c3685c9cdf2b9dcc5c948c0fd
Reviewed-by: BogDan Vatra <bogdan@kdab.com>
Reviewed-by: Rami Potinkara <rami.potinkara@qt.io>
(cherry picked from commit 7235eeab19e7e50ba102938993acc04d14b58164)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/android/templates/build.gradle

@@ -35,8 +35,8 @@ android {
      *******************************************************/
 
     compileSdkVersion androidCompileSdkVersion.toInteger()
-
     buildToolsVersion androidBuildToolsVersion
+    ndkVersion androidNdkVersion
 
     sourceSets {
         main {

src/tools/androiddeployqt/main.cpp

@@ -41,6 +41,7 @@
 #include <QUuid>
 #include <QDirIterator>
 #include <QRegularExpression>
+#include <QSettings>
 
 #include <depfile_shared.h>
 
@@ -161,6 +162,7 @@ struct Options
     QString sdkPath;
     QString sdkBuildToolsVersion;
     QString ndkPath;
+    QString ndkVersion;
     QString jdkPath;
 
     // Build paths
@@ -987,6 +989,15 @@ bool readInputFile(Options *options)
             return false;
         }
         options->ndkPath = ndk.toString();
+        const QString ndkPropertiesPath = options->ndkPath + QStringLiteral("/source.properties");
+        const QSettings settings(ndkPropertiesPath, QSettings::IniFormat);
+        const QString ndkVersion = settings.value(QStringLiteral("Pkg.Revision")).toString();
+        if (ndkVersion.isEmpty()) {
+            fprintf(stderr, "Couldn't retrieve the NDK version from \"%s\".\n",
+                    qPrintable(ndkPropertiesPath));
+            return false;
+        }
+        options->ndkVersion = ndkVersion;
     }
 
     {
@@ -2520,9 +2531,8 @@ bool buildAndroidProject(const Options &options)
 {
     GradleProperties localProperties;
     localProperties["sdk.dir"] = QDir::fromNativeSeparators(options.sdkPath).toUtf8();
-    localProperties["ndk.dir"] = QDir::fromNativeSeparators(options.ndkPath).toUtf8();
+    const QString localPropertiesPath = options.outputDirectory + QLatin1String("local.properties");
-
+    if (!mergeGradleProperties(localPropertiesPath, localProperties))
-    if (!mergeGradleProperties(options.outputDirectory + QLatin1String("local.properties"), localProperties))
         return false;
 
     QString gradlePropertiesPath = options.outputDirectory + QLatin1String("gradle.properties");
@@ -2537,6 +2547,7 @@ bool buildAndroidProject(const Options &options)
     gradleProperties["androidCompileSdkVersion"] = options.androidPlatform.split(QLatin1Char('-')).last().toLocal8Bit();
     gradleProperties["qtMinSdkVersion"] = options.minSdkVersion;
     gradleProperties["qtTargetSdkVersion"] = options.targetSdkVersion;
+    gradleProperties["androidNdkVersion"] = options.ndkVersion.toUtf8();
     if (gradleProperties["androidBuildToolsVersion"].isEmpty())
         gradleProperties["androidBuildToolsVersion"] = options.sdkBuildToolsVersion.toLocal8Bit();
     QString abiList;