win32: Makefile add winfiled target + NOTPARALLEL

win32: Makefile add winfiled target + NOTPARALLEL

- the .NOTPARALLEL option just disable the "-j" option effect at the
  level of the Makefile to keep it sequential. The "-j" will be passed
  to sub-level Makefile
- the new target allow to quickly RE-build the client when all files
  have been already compiled once.
- A quick way to build the client :
  use "make win64=yes bat=no winfiled -j 4" to quickly build the client
- this is not 100% reliable, but very convenient for faster development
  of the client.
- run the command twice to be sure.
- for the build of the package does as usual, don't use "-j"