minimal plan9port to cross-build Jehanne

lib/lib9/strdup.c

@@ -0,0 +1,16 @@
+#include <u.h>
+#include <libc.h>
+
+char*
+strdup(char *s)
+{
+	char *t;
+	int l;
+
+	l = strlen(s);
+	t = malloc(l+1);
+	if(t == nil)
+		return nil;
+	memmove(t, s, l+1);
+	return t;
+}