[Ada] VMS: increase alternate signal stack size

[bosch@gnat.com]

2001-11-28  Doug Rupp <rupp@gnat.com>

	* init.c: (__gnat_install_handler,VMS): Increase size of alternate 
	signal stack.

*** init.c	2001/09/08 13:44:35	1.1
--- init.c	2001/10/02 11:03:00	1.2
***************
*** 1463,1471 ****
    long prvhnd;
    char *c;
  
!   c = (char *) malloc (1025);
  
!   __gnat_error_prehandler_stack = &c[1024];
  
    /* __gnat_error_prehandler is an assembly function.  */
    SYS$SETEXV (1, __gnat_error_prehandler, 3, &prvhnd);
--- 1463,1471 ----
    long prvhnd;
    char *c;
  
!   c = (char *) malloc (2049);
  
!   __gnat_error_prehandler_stack = &c[2048];
  
    /* __gnat_error_prehandler is an assembly function.  */
    SYS$SETEXV (1, __gnat_error_prehandler, 3, &prvhnd);