Update popt to version 1.15

package/popt/popt.mk

@@ -3,11 +3,13 @@
 # popt
 #
 #############################################################
-POPT_VERSION:=1.14
+POPT_VERSION:=1.15
 POPT_SITE:=http://rpm5.org/files/popt
 POPT_INSTALL_STAGING = YES
 POPT_INSTALL_TARGET = YES
 
+POPT_LIBTOOL_PATCH = NO
+
 POPT_CONF_ENV = ac_cv_va_copy=yes
 
 ifeq ($(BR2_PACKAGE_LIBICONV),y)