don't call dlsym() from close() hook

it turned out that calling dlsym() may call malloc() in turn,
so we end up with the same deadlock described in the latest commit.

we thus now put all the fds passed to close pre-init into a list
and close them at init time.

this may finally fix #119.

src/libproxychains.c

@@ -110,6 +110,9 @@ static void setup_hooks(void) {
 	SETUP_SYM(close);
 }
 
+static int close_fds[16];
+static int close_fds_cnt = 0;
+
 static void do_init(void) {
 	srand(time(NULL));
 	core_initialize();
@@ -123,6 +126,8 @@ static void do_init(void) {
 
 	setup_hooks();
 
+	while(close_fds_cnt) true_close(close_fds[--close_fds_cnt]);
+
 	init_l = 1;
 }
 
@@ -305,14 +310,17 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
 
 int close(int fd) {
 	if(!init_l) {
-		SETUP_SYM(close);
-		return true_close(fd);
+		if(close_fds_cnt>=(sizeof close_fds/sizeof close_fds[0])) goto err;
+		close_fds[close_fds_cnt++] = fd;
+		errno = 0;
+		return 0;
 	}
 	/* prevent rude programs (like ssh) from closing our pipes */
 	if(fd != req_pipefd[0]  && fd != req_pipefd[1] &&
 	   fd != resp_pipefd[0] && fd != resp_pipefd[1]) {
 		return true_close(fd);
 	}
+	err:
 	errno = EBADF;
 	return -1;
 }