Use qEnvironmentVariableIntValue() instead of qgetenv().toInt()

The docs tell us that it's faster.

Pick-to: 6.2
Change-Id: Ib828ed9a10bbb617670a61e7525cbbe25704815d
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

examples/quick/shared/shared.h

@@ -59,13 +59,13 @@
     app.setOrganizationDomain("qt-project.org");\
     app.setApplicationName(QFileInfo(app.applicationFilePath()).baseName());\
     QQuickView view;\
-    if (qgetenv("QT_QUICK_CORE_PROFILE").toInt()) {\
+    if (qEnvironmentVariableIntValue("QT_QUICK_CORE_PROFILE")) {\
         QSurfaceFormat f = view.format();\
         f.setProfile(QSurfaceFormat::CoreProfile);\
         f.setVersion(4, 4);\
         view.setFormat(f);\
     }\
-    if (qgetenv("QT_QUICK_MULTISAMPLE").toInt()) {\
+    if (qEnvironmentVariableIntValue("QT_QUICK_MULTISAMPLE")) {\
         QSurfaceFormat f = view.format();\
         f.setSamples(4);\
         view.setFormat(f);\

src/quick/scenegraph/coreapi/qsgrenderer.cpp

@@ -55,7 +55,7 @@ int qt_sg_envInt(const char *name, int defaultValue)
     if (Q_LIKELY(!qEnvironmentVariableIsSet(name)))
         return defaultValue;
     bool ok = false;
-    int value = qgetenv(name).toInt(&ok);
+    int value = qEnvironmentVariableIntValue(name, &ok);
     return ok ? value : defaultValue;
 }
 

tests/auto/quickcontrols2/snippets/tst_snippets.cpp

@@ -79,7 +79,7 @@ void tst_Snippets::initTestCase()
 
     QDir screenshotsDir(QDir::current().filePath("screenshots"));
 
-    takeScreenshots = qgetenv("SCREENSHOTS").toInt();
+    takeScreenshots = qEnvironmentVariableIntValue("SCREENSHOTS");
     if (takeScreenshots)
         QVERIFY(screenshotsDir.exists() || QDir::current().mkpath("screenshots"));
 

tests/benchmarks/quickcontrols2/objectcount/tst_objectcount.cpp

@@ -42,7 +42,7 @@
 
 using namespace QQuickVisualTestUtil;
 
-static int qt_verbose = qgetenv("VERBOSE").toInt() != 0;
+static int qt_verbose = qEnvironmentVariableIntValue("VERBOSE") != 0;
 
 Q_GLOBAL_STATIC(QObjectList, qt_qobjects)