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[tests/libc] Add test for errno.h

--- a/lib/crt/amd64-sysv-netbsd/crt.s

+++ b/lib/crt/amd64-sysv-netbsd/crt.s

@@ -16,6 +16,8 @@

 	.align	8

 	.global	_start

 _start:

+	movq	%rsp,%rbp

+	andq	$-16,%rsp

 	movq	16(%rbp),%rbx

 	movq	%rbx,environ

 	call	main

--- /dev/null

+++ b/tests/libc/execute/0034-errno.c

@@ -1,0 +1,23 @@

+#include <assert.h>

+#include <errno.h>

+#include <stdio.h>

+

+/*

+output:

+testing

+done

+end:

+*/

+

+int

+main()

+{

+	puts("testing");

+	assert(errno == 0);

+	assert(ERANGE != EDOM);

+	assert(ERANGE > 0);

+	assert(EDOM > 0);

+	puts("done");

+

+	return 0;

+}

--- a/tests/libc/execute/libc-tests.lst

+++ b/tests/libc/execute/libc-tests.lst

@@ -31,3 +31,4 @@

 0031-memmove

 0032-memset

 0033-memcmp

+0034-errno