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stdlib: add setenv

--- a/include/npe/stdlib.h

+++ b/include/npe/stdlib.h

@@ -7,4 +7,6 @@

 #define EXIT_SUCCESS 0

 #define EXIT_FAILURE 1

+int setenv(char *name, char *value, int overwrite);

+

 #endif

--- a/libnpe/mkfile

+++ b/libnpe/mkfile

@@ -34,6 +34,7 @@

 	readdir.$O\

 	rename.$O\

 	round.$O\

+	setenv.$O\

 	sigaction.$O\

 	stat.$O\

 	strerror.$O\

--- /dev/null

+++ b/libnpe/setenv.c

@@ -1,0 +1,15 @@

+#include <u.h>

+#include <libc.h>

+

+int

+setenv(char *name, char *value, int overwrite)

+{

+	char *s;

+

+	if(overwrite == 0 && (s = getenv(name)) != nil){

+		free(s);

+		return 0;

+	}

+

+	return putenv(name, value);

+}