relocatable: update for MacOS X 10.4

[Bruno Haible]

The function _NSGetExecutablePath was declared as
  int _NSGetExecutablePath (char *buf, unsigned long *bufsize);
in MacOS X 10.3, but is declared as
  int _NSGetExecutablePath (char *buf, uint32_t *bufsize);
in MacOS X 10.4 and newer. This leads to a warning in progreloc.c,
indicating a bug when compiled in 64-bit mode. (MacOS X 10.3 did
not support 64-bit mode.)

This fixes it.

2009-01-17  Bruno Haible  <address@hidden>

        Update use of _NSGetExecutablePath after API change in MacOS X 10.4.
        * lib/progreloc.c (find_executable): Fix type of pointer passed to
        _NSGetExecutablePath.

--- lib/progreloc.c.orig        2009-01-17 09:18:41.000000000 +0100
+++ lib/progreloc.c     2009-01-17 09:11:50.000000000 +0100
@@ -1,5 +1,5 @@
 /* Provide relocatable programs.
-   Copyright (C) 2003-2008 Free Software Foundation, Inc.
+   Copyright (C) 2003-2009 Free Software Foundation, Inc.
    Written by Bruno Haible <address@hidden>, 2003.
 
    This program is free software: you can redistribute it and/or modify
@@ -196,10 +196,10 @@
 #endif
 #if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH
   /* On MacOS X 10.2 or newer, the function
-       int _NSGetExecutablePath (char *buf, unsigned long *bufsize);
+       int _NSGetExecutablePath (char *buf, uint32_t *bufsize);
      can be used to retrieve the executable's full path.  */
   char location[4096];
-  unsigned long length = sizeof (location);
+  unsigned int length = sizeof (location);
   if (_NSGetExecutablePath (location, &length) == 0
       && location[0] == '/')
     return canonicalize_file_name (location);