Android: Fix architecture extraction from file path in androiddeployqt

The regular expression was too greedy with the ".*" sub-expression,
thus if the prefix path contained underscores, the extracted
architecture value was wrong.

Example prefix:
~/dev/qt/qt514_built_android/qtbase

Example captured architecture:
built_android/qtbase/plugins/platforms/android/libqtforandroid_x86

First extract the file name from the given path, and then match
on just the file name.

Change-Id: I8e56e56747096c7a2398e959d91c2d1f65de2495
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>

src/tools/androiddeployqt/main.cpp

@@ -314,8 +314,10 @@ static QString shellQuote(const QString &arg)
 
 QString architecureFromName(const QString &name)
 {
+    const QFileInfo fi(name);
+    const QString extractedFileName = fi.fileName();
     QRegExp architecture(QStringLiteral(".*_(.*)\\.so"));
-    if (!architecture.exactMatch(name))
+    if (!architecture.exactMatch(extractedFileName))
         return {};
     return architecture.capturedTexts().last();
 }