package/assimp: needs wchar

Fixes:
 - http://autobuild.buildroot.org/results/d989f895efe05dd5d1e2594d2dc38e9fc476e0d3

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

package/assimp/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_ASSIMP
 	bool "assimp"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_USE_WCHAR
 	select BR2_PACKAGE_ZLIB
 	help
 	  Open Asset Import Library (assimp) is a portable Open Source
@@ -11,5 +12,5 @@ config BR2_PACKAGE_ASSIMP
 
 	  http://www.assimp.org
 
-comment "assimp needs a toolchain w/ C++"
-	depends on !BR2_INSTALL_LIBSTDCPP
+comment "assimp needs a toolchain w/ C++, wchar"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR