buildsys: turn off forced EXTRA_WARNINGS on i386

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

extra/Configs/Config.in

@@ -501,8 +501,6 @@ config UCLIBC_HAS_THREADS_NATIVE
 	bool "Native POSIX Threading (NPTL)"
 	select UCLIBC_HAS_TLS
 	select UCLIBC_HAS_STDIO_FUTEXES
-	# NPTL local:
-	select EXTRA_WARNINGS
 	# i386 has no lowlevellock support (yet) as opposed to i486 onward
 	depends on !CONFIG_386
 	help