remove pre-req from postprocess that are already pulled by tail_build

postprocess/prj/build.lst

-po      postprocess     ::      BINFILTER:binfilter configmgr CRASHREP:crashrep CT2N:ct2n embeddedobj embedserv EPM:epm DESKTOP:extensions extras DESKTOP:fpicker HELP:helpcontent2 io LIBRSVG:librsvg ODK:odk officecfg remotebridges scp2 DESKTOP:setup_native sysui testtools ucb UnoControls ure wizards MORE_FONTS:more_fonts DICTIONARIES:dictionaries PYUNO:pyuno readlicense_oo DESKTOP:unodevtools JFREEREPORT:jfreereport REPORTBUILDER:reportbuilder LANGUAGETOOL:languagetool SDEXT:sdext MYSQLC:mysqlc NLPSOLVER:nlpsolver STLPORT:stlport LIBXSLT:libxslt smoketest tail_build NULL
+po      postprocess     ::      BINFILTER:binfilter CRASHREP:crashrep CT2N:ct2n embeddedobj embedserv EPM:epm DESKTOP:extensions extras HELP:helpcontent2 LIBRSVG:librsvg ODK:odk scp2 testtools UnoControls wizards MORE_FONTS:more_fonts DICTIONARIES:dictionaries PYUNO:pyuno DESKTOP:unodevtools JFREEREPORT:jfreereport REPORTBUILDER:reportbuilder LANGUAGETOOL:languagetool SDEXT:sdext MYSQLC:mysqlc NLPSOLVER:nlpsolver STLPORT:stlport smoketest tail_build NULL
 po	postprocess			    	usr1	-	all	po_mkout NULL
 po	postprocess\checkxml		nmake	-	all	po_checkxml NULL
 po	postprocess\packconfig		nmake	-	all	po_packconfig po_checkxml NULL