Qmake: Move Qt library path after other libraries

Paths are prepended, so the first one to be added is actually the last
search path.

On a debian machine with system-installed Qt and Qbs, if you execute Qtc
from another instance of Qtc with "Add build library search path" checked,
LD_LIBRARY_PATH has /usr/lib/x86_64-linux-gnu before $BUILD/lib/qtcreator.

This means that the system's Qbs lib will be loaded instead of the one in
RPATH, which is bad (i.e. qbs build fails because it cannot find
$BUILD/lib/x86_64-linux-gnu/qbs/qbs_processlauncher).

Change-Id: Ibe6778ba8a06da1680e034e31a8fee6d9a81c484
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/libs/utils/environment.cpp

@@ -332,6 +332,13 @@ void Environment::prependOrSetLibrarySearchPath(const QString &value)
     }
 }
 
+void Environment::prependOrSetLibrarySearchPaths(const QStringList &values)
+{
+    Utils::reverseForeach(values, [this](const QString &value) {
+        prependOrSetLibrarySearchPath(value);
+    });
+}
+
 Environment Environment::systemEnvironment()
 {
     return *staticSystemEnvironment();