Fix includes and complete test_etcp_connection_init build

- Fixed header includes (ll_queue.h, u_async.h, tinycrypt paths)
- Updated Makefile.am with proper CFLAGS and all dependencies
- Test compiles and runs successfully

src/etcp.c

@@ -1,8 +1,9 @@
 // etcp.c - ETCP Protocol Implementation
-#include "u_async.h"
+#include "../lib/u_async.h"
 #include "utun_instance.h"
 #include "etcp.h"
 #include "../lib/debug_config.h"
+#include "../lib/ll_queue.h"
 #include "crc32.h"
 #include "secure_channel.h"
 #include <stdlib.h>

src/etcp.h

@@ -4,7 +4,6 @@
 #define ETCP_H
 
 #include "etcp_connections.h"
-#include "ll_queue.h"
 #include "secure_channel.h"
 #include <stdint.h>
 

src/etcp_connections.c

@@ -11,7 +11,7 @@
 #include "crc32.h"
 #include "etcp.h"
 #include "../lib/memory_pool.h"
-#include "u_async.h"
+#include "../lib/u_async.h"
 #include <stdlib.h>
 #include <time.h>
 

src/secure_channel.c

@@ -1,13 +1,13 @@
 /* sc_lib.c - Secure Channel library implementation using TinyCrypt */
 
 #include "secure_channel.h"
-#include <tinycrypt/ecc.h>
-#include <tinycrypt/ecc_dh.h>
-#include <tinycrypt/aes.h>
-#include <tinycrypt/ccm_mode.h>
-#include <tinycrypt/constants.h>
-#include <tinycrypt/ecc_platform_specific.h>
-#include <tinycrypt/sha256.h>
+#include "../tinycrypt/lib/include/tinycrypt/ecc.h"
+#include "../tinycrypt/lib/include/tinycrypt/ecc_dh.h"
+#include "../tinycrypt/lib/include/tinycrypt/aes.h"
+#include "../tinycrypt/lib/include/tinycrypt/ccm_mode.h"
+#include "../tinycrypt/lib/include/tinycrypt/constants.h"
+#include "../tinycrypt/lib/include/tinycrypt/ecc_platform_specific.h"
+#include "../tinycrypt/lib/include/tinycrypt/sha256.h"
 #include <string.h>
 #include <stddef.h>
 #include <sys/types.h>