Fix typo in usage message.

Author: yyamano

mrbgems/mruby-bin-mruby-config/mruby-config

@@ -10,7 +10,7 @@ while [ $# -gt 0 ]; do
             echo "  switches:"
             echo "  --cflags                    print flags passed to compiler"
             echo "  --ldflags                   print flags passed to linker"
-            echo "  --ldflags-before-libs       print flags passwd to linker before linked libraries"
+            echo "  --ldflags-before-libs       print flags passed to linker before linked libraries"
             echo "  --libs                      print linked libraries"
             exit 0;;
   esac

mrbgems/mruby-bin-mruby-config/mruby-config.bat

@@ -32,5 +32,5 @@ echo Usage: mruby-config [switches]
 echo   switches:
 echo   --cflags                   print flags passed to compiler
 echo   --ldflags                  print flags passed to linker
-echo   --ldflags-before-libs      print flags passwd to linker before linked libraries
+echo   --ldflags-before-libs      print flags passed to linker before linked libraries
 echo   --libs                     print linked libraries