package/minizip: select libiconv if needed

iconv.h is always included by mz_os_posix.c so select
BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE

Fixes:
 - No autobuilder failures

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/minizip/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_MINIZIP
 	bool "minizip"
 	depends on BR2_USE_WCHAR
+	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
 	help
 	  Enables to extract files from a .zip archive file.
 	  It is compatible with PKZip 2.04g, WinZip, InfoZip,