package/powertop: needs gettextize, 2nd try

If host-gettext was compiled before powertop it is picked up by autoreconf which
leads to a broken compile. To fix this unconditionally include host-gettext as
dependency and move

POWERTOP_GETTEXTIZE = YES

outside the if-clause for BR2_NEEDS_GETTEXT

Fixes
http://autobuild.buildroot.net/results/24e/24e312271cf07a8dd966b43f153a06ddc858a786/
http://autobuild.buildroot.net/results/511/511a1c76bfd0ebf637e5abcd6fecc4d6a683ed3e/
http://autobuild.buildroot.net/results/652/65246f6f71e67c2637efbe8bb6e501750629d5fb/



and many others

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>