Allow for arguments that have an equals as part of it

Since you can pass a define to org.gradle.jvmargs that can have the
name=value approach, then we need to ensure that this is accounted for.

Task-number: QTBUG-88989
Pick-to: 6.1 5.15
Change-Id: I2a795bff7ce683eca521b3a987293b3320accb6a
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/tools/androiddeployqt/main.cpp

@@ -2363,9 +2363,9 @@ static GradleProperties readGradleProperties(const QString &path)
         if (line.trimmed().startsWith('#'))
             continue;
 
-        QList<QByteArray> prop(line.split('='));
-        if (prop.size() > 1)
-            properties[prop.at(0).trimmed()] = prop.at(1).trimmed();
+        const int idx = line.indexOf('=');
+        if (idx > -1)
+            properties[line.left(idx).trimmed()] = line.mid(idx + 1).trimmed();
     }
     file.close();
     return properties;