there no nixsyscall()s, but the number is kept for back compat with
old binaries, until the number is reused.
This removes nixsyscall() from this program by now.

Reference: /n/patches.lsub.org/patch/syscallfix
Date: Wed Apr 18 15:26:42 CES 2012
Signed-off-by: nemo@lsub.org

--- /sys/src/cmd/syscall/mkfile	Thu Apr 12 12:26:02 2012
+++ /sys/src/cmd/syscall/mkfile	Wed Apr 18 15:24:13 2012
@@ -19,6 +19,7 @@
 
 tab.h:	$SYSCALL
 	sed '/#define._X[0-9_]/d;
+		/#define.NIXSYSCALL/d;
 		/#define.NSYSCALL/d;
 		s/#define.([A-Z0-9_][A-Z0-9_]*).*/	"\1",	(int(*)(...))\1,/' $SYSCALL |
 		tr A-Z a-z > tab.h