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[lib/c] Add getenv() for posix systems

--- /dev/null

+++ b/lib/c/target/posix/getenv.c

@@ -1,0 +1,22 @@

+#include <stdlib.h>

+#include <string.h>

+#undef getenv

+

+extern char **environ;

+

+char *

+getenv(const char *name)

+{

+	char **p;

+	size_t len = strlen(name);

+

+	for (p = environ; *p; ++p) {

+		if (!memcmp(name, *p, len) && (*p)[len] == '=')

+			break;

+	}

+

+	if (!*p) 

+		return NULL;

+

+	return &(*p)[len];

+}

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

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

@@ -8,10 +8,16 @@

 	.p2align 2

 	.long      200000000

+	.bss

+environ:

+	.quad	0

+

 	.text

 	.align	8

 	.global	_start

 _start:

+	movq	16(%rbp),%rbx

+	movq	%rbx,environ

 	call	main

-	movl    %eax, %edi

+	movl    %eax,%edi

 	jmp	exit