[tz] "make clean" leaves "libtz.a" behind

[Arthur David Olson]

Doing a "make clean" does not remove "libtz.a"--a fix is attached (and
appears in mangled form below).

    @dashdashado

*** tz2014braw/Makefile    2014-03-25 00:30:17.000000000 -0400
--- tz2014bcooked/Makefile    2014-03-26 18:53:56.650329500 -0400
***************
*** 443,449 ****

  clean_misc:
          rm -f core *.o *.out \
!           date tzselect version.h zdump zic yearistype
  clean:        clean_misc
          rm -fr tzpublic

--- 443,449 ----

  clean_misc:
          rm -f core *.o *.out \
!           date tzselect version.h zdump zic yearistype libtz.a
  clean:        clean_misc
          rm -fr tzpublic
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*** tz2014braw/Makefile	2014-03-25 00:30:17.000000000 -0400
--- tz2014bcooked/Makefile	2014-03-26 18:53:56.650329500 -0400
***************
*** 443,449 ****
  
  clean_misc:
  		rm -f core *.o *.out \
! 		  date tzselect version.h zdump zic yearistype
  clean:		clean_misc
  		rm -fr tzpublic
  
--- 443,449 ----
  
  clean_misc:
  		rm -f core *.o *.out \
! 		  date tzselect version.h zdump zic yearistype libtz.a
  clean:		clean_misc
  		rm -fr tzpublic