androiddeployqt: only write enabled architectures to build.gradle

androiddeployqt writes a list of architectures into the build.gradle
file. This list should only contain the architectures which are enabled.
This patch adapts the generation of this list accordingly.
Amends 07cfab07a2.

Change-Id: I5c7c1886c54cc3b9a7e42af6eefbaf2a067a67d5
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/tools/androiddeployqt/main.cpp

@@ -2628,6 +2628,8 @@ bool buildAndroidProject(const Options &options)
         gradleProperties["androidBuildToolsVersion"] = options.sdkBuildToolsVersion.toLocal8Bit();
     QString abiList;
     for (auto it = options.architectures.constBegin(); it != options.architectures.constEnd(); ++it) {
+        if (!it->enabled)
+            continue;
         if (abiList.size())
             abiList.append(u",");
         abiList.append(it.key());