minizip: depends on wchar

minizip depends on wchar since version 2.7.0 and
https://github.com/nmoinvaz/minizip/commit/21a3102db475e662aabedc7b191e5732734847ec

Fixes:
 - http://autobuild.buildroot.org/results/2e83b694b91fe96e1a044385d327d7abd2183e24

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/minizip/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_MINIZIP
 	bool "minizip"
+	depends on BR2_USE_WCHAR
 	help
 	  Enables to extract files from a .zip archive file.
 	  It is compatible with PKZip 2.04g, WinZip, InfoZip,
@@ -12,3 +13,6 @@ config BR2_PACKAGE_MINIZIP_DEMOS
 	depends on BR2_PACKAGE_MINIZIP
 	help
 	  Enable minizip binary tool.
+
+comment "minizip needs a toolchain w/ wchar"
+	depends on !BR2_USE_WCHAR