Autoupdate and AC_ERROR

[NightStrike]

I ran autoupdate on a configure.ac that yielded the following diff:

-  [AC_ERROR([Invalid option: $enable_sdk.  Please choose one of ddk,
directx, or all.])])
+  [AC_MSG_ERROR(Invalid option: $enable_sdk.  Please choose one of
ddk, directx, or all.)])

The intent of the change is fine, but how autoupdate went about it is
not.  It messed up the nesting of ] and ), as you can see.