Add missing dependencies to GAUDI-externals target

I was trying to set up a local LCG stack to build LHCb's software stack on and noticed that the target GAUDI-externals didn't provide all dependencies needed by Gaudi.

projects/CMakeLists.txt

@@ -335,10 +335,8 @@ LCG_add_test(cool-tests
 endif()
 
 #---GaudiDeps------------------------------------------------------------------------------------------
-#set(GAUDI-dependencies AIDA Boost Python GSL ROOT QMtest clhep HepMC HepPDT RELAX
-#                       GCCXML tbb XercesC uuid CppUnit gperftools)
 set(GAUDI-alldeps  AIDA Boost Python GSL ROOT clhep HepMC HepPDT RELAX
-                   uuid tbb XercesC rangev3 cppgsl CppUnit QMtest nose gperftools six networkx ninja CMake xenv)
+                   uuid tbb XercesC rangev3 cppgsl CppUnit QMtest nose gperftools six networkx ninja CMake xenv doxygen fmt jsonmcpp )
 
 set(GAUDI-dependencies)
 foreach(dep ${GAUDI-alldeps})