Utils: Do not blindly assume qmake* is an executable

Change-Id: Iec444d2883536a0140197af9e8b90e3050d8fc5b
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/libs/utils/buildablehelperlibrary.cpp

@@ -155,7 +155,7 @@ QStringList BuildableHelperLibrary::possibleQMakeCommands()
     // On Unix some distributions renamed qmake with a postfix to avoid clashes
     // On OS X, Qt 4 binary packages also has renamed qmake. There are also symbolic links that are
     // named "qmake", but the file dialog always checks against resolved links (native Cocoa issue)
-    return QStringList(QLatin1String("qmake*"));
+    return QStringList(HostOsInfo::withExecutableSuffix("qmake*"));
 }
 
 // Copy helper source files to a target directory, replacing older files.