[PATCH] uml: add _text definition to linker scripts

kallsyms now refers to addresses as '_text + 0xADDRESS', rather than just
'0xADDRESS', so we need to define _text.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>