move sysui to postprocess

The only thing that sysui exports that is used by another package are
application icons, used in desktop (windows build only). But since
gbuildification of desktop they are included directly from
$(SRCDIR)/sysui/desktop/icons instead of $(OUTDIR)/inc/icons, so the
dependency is no longer necessary.

Change-Id: I6fa3153d3793e785c1ed602c3e67c86cead2bae2

desktop/prj/build.lst

-dt      desktop :    TRANSLATIONS:translations sfx2 stoc BERKELEYDB:berkeleydb sysui BOOST:boost svx DESKTOP:xmlhelp sal salhelper unoil officecfg offapi filter LIBXSLT:libxslt NULL
+dt      desktop :    TRANSLATIONS:translations sfx2 stoc BERKELEYDB:berkeleydb BOOST:boost svx DESKTOP:xmlhelp sal salhelper unoil officecfg offapi filter LIBXSLT:libxslt NULL
 dt	desktop									usr1	-	all	dt_mkout NULL
 dt	desktop\prj						nmake	-	all	dt_prj NULL

postprocess/prj/build.lst

-po      postprocess     ::      BINFILTER:binfilter CRASHREP:crashrep CT2N:ct2n EPM:epm extras HELP:helpcontent2 LIBRSVG:librsvg ODK:odk MORE_FONTS:more_fonts DICTIONARIES:dictionaries LANGUAGETOOL:languagetool MYSQLC:mysqlc DESKTOP:setup_native STLPORT:stlport tail_build NULL
+po      postprocess     ::      BINFILTER:binfilter CRASHREP:crashrep CT2N:ct2n EPM:epm extras HELP:helpcontent2 LIBRSVG:librsvg ODK:odk MORE_FONTS:more_fonts DICTIONARIES:dictionaries LANGUAGETOOL:languagetool MYSQLC:mysqlc DESKTOP:setup_native STLPORT:stlport sysui 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

tail_build/prj/build.lst

-tb      tail_build : AFMS:afms APACHE_COMMONS:apache-commons BSH:beanshell BERKELEYDB:berkeleydb BOOST:boost CAIRO:cairo CPPUNIT:cppunit DESKTOP:codemaker CURL:curl EXPAT:expat FONTCONFIG:fontconfig FREETYPE:freetype GRAPHITE:graphite HSQLDB:hsqldb HUNSPELL:hunspell HYPHEN:hyphen ICU:icu DESKTOP:l10ntools JFREEREPORT:jfreereport JPEG:jpeg LCMS2:lcms2 LIBCDR:libcdr LIBCMIS:libcmis LIBEXTTEXTCAT:libexttextcat LIBMSPUB:libmspub LIBXML2:libxml2 LIBXMLSEC:libxmlsec LIBXSLT:libxslt LIBWPG:libwpg LIBWPS:libwps LIBWPD:libwpd LIBVISIO:libvisio LPSOLVE:lpsolve MDDS:mdds MOZ:moz MYTHES:mythes NEON:neon NSS:nss OPENLDAP:openldap OPENSSL:openssl POSTGRESQL:postgresql PYTHON:python REDLAND:redland SAXON:saxon TRANSLATIONS:translations VIGRA:vigra XPDF:xpdf ZLIB:zlib bridges cli_ure comphelper cppu cppuhelper external jurt jvmaccess jvmfwk offapi officecfg DESKTOP:rdbmaker readlicense_oo remotebridges RHINO:rhino ridljar sal salhelper solenv soltools stoc sysui ucbhelper udkapi xmlreader xsltml NULL
+tb      tail_build : AFMS:afms APACHE_COMMONS:apache-commons BSH:beanshell BERKELEYDB:berkeleydb BOOST:boost CAIRO:cairo CPPUNIT:cppunit DESKTOP:codemaker CURL:curl EXPAT:expat FONTCONFIG:fontconfig FREETYPE:freetype GRAPHITE:graphite HSQLDB:hsqldb HUNSPELL:hunspell HYPHEN:hyphen ICU:icu DESKTOP:l10ntools JFREEREPORT:jfreereport JPEG:jpeg LCMS2:lcms2 LIBCDR:libcdr LIBCMIS:libcmis LIBEXTTEXTCAT:libexttextcat LIBMSPUB:libmspub LIBXML2:libxml2 LIBXMLSEC:libxmlsec LIBXSLT:libxslt LIBWPG:libwpg LIBWPS:libwps LIBWPD:libwpd LIBVISIO:libvisio LPSOLVE:lpsolve MDDS:mdds MOZ:moz MYTHES:mythes NEON:neon NSS:nss OPENLDAP:openldap OPENSSL:openssl POSTGRESQL:postgresql PYTHON:python REDLAND:redland SAXON:saxon TRANSLATIONS:translations VIGRA:vigra XPDF:xpdf ZLIB:zlib bridges cli_ure comphelper cppu cppuhelper external jurt jvmaccess jvmfwk offapi officecfg DESKTOP:rdbmaker readlicense_oo remotebridges RHINO:rhino ridljar sal salhelper solenv soltools stoc ucbhelper udkapi xmlreader xsltml NULL
 tb tail_build\prj nmake - all tb_prj   NULL