package/powertop: fix gettext build

Fix gettext build raised since bump to version 2.15 in commit
d65b960859046be486ced6c490d3671bd1392661:

*** error: gettext infrastructure mismatch: using a Makefile.in.in from gettext version 0.18 but the autoconf macros are from gettext version 0.20

Fixes: d65b960859046be486ced6c490d3671bd1392661
 - http://autobuild.buildroot.org/results/bb80a7842d18651e5069f3a91f06a9c23218d260

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/powertop/powertop.mk

@@ -20,6 +20,7 @@ POWERTOP_DEPENDENCIES = \
 POWERTOP_CONF_ENV = LIBS=$(TARGET_NLS_LIBS)
 # 0001-add-disable-stack-protector-option.patch
 POWERTOP_AUTORECONF = YES
+POWERTOP_AUTOPOINT = YES
 POWERTOP_AUTORECONF_OPTS = --include=$(HOST_DIR)/share/autoconf-archive
 POWERTOP_CONF_OPTS = --disable-stack-protector