package/nodejs: disable icu support for host build

package/nodejs: disable icu support for host build

Fixes:
http://autobuild.buildroot.net/results/1d6/1d6bbef2cb0c8c2e00b6d7511814ff9ddb2e3073/
http://autobuild.buildroot.net/results/4c7/4c7fc92a42405e25f41394fa44f5bdc27a4538c4/

Apperently if both icu and nodejs are enabled during the nodejs host build
the nodejs buildsystem gets confused by the icu version installed by
Buildroot (icu 58.2) and the one bundled with the nodejs source tree(icu
57), which ends up in linking-time errors as:

"""
undefined reference to
`icu_58::NumberFormat::format(icu_58::StringPiece,
icu_58::UnicodeString&, icu_58::FieldPositionIterator*, UErrorCode&)
const'
"""
(note the icu_58 in the symbol name while the bundled icu version is 57)

 This patch disables the (not used) i18n support in the nodejs host build
config in order to fix the issue. The issue doesn't affect the target build of
nodejs.

[Peter: add autobuilder references]
Signed-off-by: Zoltan Gyarmati <mr.zoltan.gyarmati@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>