syscall: much larger buffer
 [rsc] --rw-rw-r-- M 951118 glenda sys 3954 Mar 21 11:21 sys/src/cmd/syscall/syscall.c
	/n/sourcesdump/2006/0321/plan9/sys/src/cmd/syscall/syscall.c:3,9 - 
	/n/sourcesdump/2006/0322/plan9/sys/src/cmd/syscall/syscall.c:3,9
	  #include <sys.h>
	  #include <fcall.h>
	  
	- char	buf[8192];
	+ char	buf[1048576];
	  #define	NARG	5
	  uintptr	arg[NARG];