Narrow some #if-ery on QT_BUILD_INTERNAL to test more normally

Only a small early part of tst_QTimeZone::utcTest() actually needed
access to internal APIs, so only apply the #if-ery to that part.

Pick-to: 6.9 6.8 6.5 5.15
Change-Id: Ifebd70005f87bbef5d03fa24fe33134fd802e2e5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/corelib/time/qtimezone/tst_qtimezone.cpp

@@ -1326,6 +1326,7 @@ void tst_QTimeZone::utcTest()
     QCOMPARE(tzp.daylightTimeOffset(0), 0);
     QCOMPARE(tzp.hasDaylightTime(), false);
     QCOMPARE(tzp.hasTransitions(), false);
+#endif // QT_BUILD_INTERNAL
 
     // Test UTC accessor
     const QDateTime now = QDateTime::currentDateTime();
@@ -1386,7 +1387,6 @@ void tst_QTimeZone::utcTest()
     QCOMPARE(tz.offsetFromUtc(now), 123456);
     QCOMPARE(tz.standardTimeOffset(now), 123456);
     QCOMPARE(tz.daylightTimeOffset(now), 0);
-#endif // QT_BUILD_INTERNAL
 }
 
 // Relies on local variable names: zone tzp and locale enUS.