[libnr] some optimizations

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  -- Description --
  Patch against sodipodi 0.34 in Debian GNU+Linux.
  Optimized local varables, reduced stack usage of recurcive
  calls, (IMHO) better perfomance. Got ride of "gotos", see
  <http://www.acm.org/classics/oct95/>
  Size of object files is the same:

  olecom@czluon:libnr$ size *goto
     text    data     bss     dec     hex filename
    13622      20       0   13642    354a nr-path.o-goto
    16750      20       8   16778    418a nr-pathops.o-goto
     8644       0       0    8644    21c4 nr-stroke.o-goto
  olecom@czluon:libnr$ size nr-path.o nr-pathops.o nr-stroke.o
     text    data     bss     dec     hex filename
    13638      20       0   13658    355a nr-path.o
    16766      20       8   16794    419a nr-pathops.o
     8612       0       0    8612    21a4 nr-stroke.o
  olecom@czluon:libnr$ echo goto: $((13642+16778+8644))
  goto: 39064
  olecom@czluon:libnr$ echo not : $((13658+16794+8612))
  not : 39064
  olecom@czluon:libnr$

Lauris Kaplinski, that was code based on libart (with that gotos ;)

Comments are welcome.

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