buildroot

Revert "gettext: build libintl unconditionally for uClibc/musl"

This reverts commit 431d00abc1ffd0db287f0392e45229a53db7a187, which in
fact doesn't work for static linking situations, as can be seen in:

  http://autobuild.buildroot.net/results/a6a4039f23a6fbd2bdb5938bcef097a7310452cc/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>