Add working realpath implementation to glibc-compat

ports/glibc-compat/src/stubs.c

Index: ports/glibc-compat/src/stubs.c
diff --git a/ports/glibc-compat/src/stubs.c b/ports/glibc-compat/src/stubs.c
index ed024b58f2873958713d88482a4162e0837f1b45..e2f4f406666503e2a36e6e4532d95e5d80897137 100644
--- a/ports/glibc-compat/src/stubs.c
+++ b/ports/glibc-compat/src/stubs.c
@@ -440,11 +440,6 @@ int connect(int sockfd, const struct sockaddr *addr,
   UNIMPLEMENTED_FATAL();
 }
 
-char* realpath(const char* path, char* resolved) __attribute__ ((weak));
-char* realpath(const char* path, char* resolved) {
-  UNIMPLEMENTED_NOSYS_RTN(NULL);
-}
-
 int getaddrinfo(const char *, const char *, const struct addrinfo *,
                 struct addrinfo **) __attribute__ ((weak));
 int getaddrinfo(const char *node, const char *service,