re-bootstrap lrelease

this is needed for being able to x-compile translations.

Change-Id: Ia2a00e8195f84feaedd036e6b7b83df373425b38
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/linguist/lrelease/lrelease.pro

-QT = core-private
+option(host_build)
+QT = bootstrap-private
 DEFINES += QT_NO_CAST_FROM_ASCII QT_NO_CAST_TO_ASCII
 
 SOURCES += main.cpp

src/linguist/shared/formats.pri

 
 # infrastructure
-QT *= xml
+!host_build: QT *= xml
 
 INCLUDEPATH *= $$PWD