Remove no longer working USE_LIBPATH build option

BUILDING.md

@@ -105,13 +105,6 @@ Available Defines
                           example:
                           $ export NO_X11="true"
 
-     USE_LIBPATH          By default, /usr/lib/ is used for libFalkon and /usr/lib/falkon
-                          for plugins.
-                          You can change it by setting this define.
-
-                          example:
-                          $ export USE_LIBPATH="/usr/lib64"
-
      NO_SYSTEM_DATAPATH   By default, Falkon is using /usr/share/falkon/ path
                           for storing themes and translations.
                           By setting this define, Falkon will use path of execution.

CMakeLists.txt

@@ -48,10 +48,6 @@ option(NONBLOCK_JS_DIALOGS "TODO" OFF)
 if (NONBLOCK_JS_DIALOGS)
     add_definitions(-DNONBLOCK_JS_DIALOGS)
 endif()
-option(USE_LIBPATH "TODO" "") # REMOVE?
-if (USE_LIBPATH)
-    add_definitions(-DUSE_LIBPATH=\"${USE_LIBPATH}\")
-endif()
 option(DISABLE_DBUS "TODO" OFF)
 if (DISABLE_DBUS)
     add_definitions(-DDISABLE_DBUS)
@@ -61,7 +57,7 @@ if (DISABLE_UPDATES_CHECK)
     add_definitions(-DDISABLE_UPDATES_CHECK)
 endif()
 # Note: the old qmake option DEBUG_BUILD is now -DCMAKE_BUILD_TYPE=Debug, and FALKON_PREFIX is now -DCMAKE_INSTALL_PREFIX
-#       SHARE_FOLDER is now auto-detected, so is USE_LIBPATH.
+#       SHARE_FOLDER is now auto-detected.
 
 # Mandatory: Qt5
 set(QT_MIN_VERSION "5.8.0")

src/lib/app/datapaths.cpp

@@ -115,10 +115,6 @@ void DataPaths::init()
     QDir dir;
     dir.mkpath(m_paths[Config].at(0));
     dir.mkpath(m_paths[Temp].at(0));
-
-#ifdef USE_LIBPATH
-    m_paths[Plugins].append(QLatin1String(USE_LIBPATH "/falkon"));
-#endif
 }
 
 void DataPaths::initCurrentProfile(const QString &profilePath)