qt.conf: default LibraryExecutables to bin/ on windows

this matches the platform-specific configure default.

as a "side effect", this fixes the in-builddir execution of webkit
examples, as the non-installed qmake now agrees with QLibraryInfo about
the location of QWebProcess.exe.

Task-number: QTBUG-30322
Change-Id: Id28f2c246e4bfda6d5f4d719a66a16f24bb7cdb7
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

src/corelib/global/qlibraryinfo.cpp

@@ -273,7 +273,11 @@ static const struct {
     { "Documentation", "doc" }, // should be ${Data}/doc
     { "Headers", "include" },
     { "Libraries", "lib" },
+#ifdef Q_OS_WIN
+    { "LibraryExecutables", "bin" },
+#else
     { "LibraryExecutables", "libexec" }, // should be ${ArchData}/libexec
+#endif
     { "Binaries", "bin" },
     { "Plugins", "plugins" }, // should be ${ArchData}/plugins
     { "Imports", "imports" }, // should be ${ArchData}/imports