Revert "BUG: force usage of the ld gold linker for linux QT5 build in the...

Revert "BUG: force usage of the ld gold linker for linux QT5 build in the Superbuild (link errors with ld bfd)"

This reverts commit 9df40e7f.

SuperBuild/CMake/External_qt5.cmake

@@ -98,7 +98,7 @@ if(UNIX)
     set(QT5_SB_CONFIG "${QT5_SB_CONFIG} -no-framework")
   else()
       #Linux
-      set(QT5_SB_CONFIG "${QT5_SB_CONFIG} -linker gold -no-glib -no-fontconfig")
+      set(QT5_SB_CONFIG "${QT5_SB_CONFIG} -no-glib -no-fontconfig")
   endif()
   #common for all unix
   set(QT5_SB_CONFIG "${QT5_SB_CONFIG} -no-dbus -no-icu -v")