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libc: Remove _sys_nerr

_sys_nerr variable is not needed anymore because there is
a macro with the maximum number of errors that does the
same work.

--- a/src/libc/arch/mkerrstr

+++ b/src/libc/arch/mkerrstr

@@ -1,7 +1,5 @@

-#!/bin/sh

+trap 'rm -f $$.tmp' EXIT HUP INT QUIT TERM

-trap 'r=$?; rm -f $$.tmp; exit $r' EXIT HUP INT QUIT TERM

-

 awk '

 /^#define[ \t]*E/{

 	str = ""

@@ -9,8 +7,6 @@

 		str = str " " $i

 	sub(/^ /, "", str)

 	errstr[$2] = str

-	if ($3 > max)

-		max = $3;

 }

 END {

@@ -20,5 +16,4 @@

 		printf "\t%-20.20s = \"%s\",\n", "[" i "]", errstr[i]

 	print "};"

-	print "const int _sys_nerr =", max";"

 }' $@ > $$.tmp && mv $$.tmp _sys_errlist.c