package wxwidgets: disable specific compiler error in test program

src/wxwidgets.mk

@@ -120,7 +120,7 @@ define $(PKG)_BUILD
 
     # build test program
     '$(TARGET)-g++' \
-        -W -Wall -Werror -pedantic -std=gnu++0x \
+        -W -Wall -Werror -Wno-error=unused-local-typedefs -pedantic -std=gnu++0x \
         '$(2).cpp' -o '$(PREFIX)/$(TARGET)/bin/test-wxwidgets.exe' \
         `'$(TARGET)-wx-config' --cflags --libs`
 endef