x11_extensions is already in tail_build

Change-Id: I25b955ad98cdd70236765aa819f49af19c7307b7

tail_build/prj/build.lst

-tb      tail_build : AFMS:afms APACHE_COMMONS:apache-commons BSH:beanshell BERKELEYDB:berkeleydb BOOST:boost CAIRO:cairo 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 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 OPENSSL:openssl POSTGRESQL:postgresql PYTHON:python REDLAND:redland SANE:sane SAXON:saxon DESKTOP:setup_native TRANSLATIONS:translations TWAIN:twain VIGRA:vigra X11_EXTENSIONS:x11_extensions XPDF:xpdf ZLIB:zlib basegfx bridges comphelper cppu cppuhelper cpputools i18npool i18nutil icc javaunohelper jurt jvmaccess jvmfwk offapi officecfg oovbaapi QADEVOOO:qadevOOo DESKTOP:rdbmaker readlicense_oo RHINO:rhino ridljar sal salhelper sax solenv soltools stoc sysui tools ucbhelper udkapi unoil unotest ure xmlreader xsltml NULL
+tb      tail_build : AFMS:afms APACHE_COMMONS:apache-commons BSH:beanshell BERKELEYDB:berkeleydb BOOST:boost CAIRO:cairo 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 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 OPENSSL:openssl POSTGRESQL:postgresql PYTHON:python REDLAND:redland SANE:sane SAXON:saxon DESKTOP:setup_native TRANSLATIONS:translations TWAIN:twain VIGRA:vigra XPDF:xpdf ZLIB:zlib basegfx bridges comphelper cppu cppuhelper cpputools i18npool i18nutil icc javaunohelper jurt jvmaccess jvmfwk offapi officecfg oovbaapi QADEVOOO:qadevOOo DESKTOP:rdbmaker readlicense_oo RHINO:rhino ridljar sal salhelper sax solenv soltools stoc sysui tools ucbhelper udkapi unoil unotest ure xmlreader xsltml NULL
 tb tail_build\prj nmake - all tb_prj   NULL