Fix help message of apinames.

* src/tools/apinames.c: The first header file must be
  given after the options.  All arguments after the
  first header file are dealt as header files to be
  parsed, regardless with their leading "-".

  For example,
  "apinames include/freetype/freetype.h -dFREETYPE.DLL"
  warns "unable to open -dFREETYPE.DLL".

  Thus, the "header1" must be given after the arguments
  to be parsed as the options.
1 file changed