Fix compilation errors on esp-idf platform (bytecodealliance#3224)

The issue was reported in bytecodealliance#3208.

core/iwasm/interpreter/wasm_loader.c

@@ -11421,7 +11421,7 @@ wasm_loader_prepare_bytecode(WASMModule *module, WASMFunction *func,
 
             case WASM_OP_BR_TABLE:
             {
-                uint32 depth, default_arity, arity = 0;
+                uint32 depth = 0, default_arity, arity = 0;
                 BranchBlock *target_block;
                 BlockType *target_block_type;
 #if WASM_ENABLE_FAST_INTERP == 0

core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c

@@ -426,7 +426,7 @@ sprintf_wrapper(wasm_exec_env_t exec_env, char *str, const char *format,
     if (!wasm_runtime_get_native_addr_range(module_inst, (uint8 *)str, NULL,
                                             &native_end_offset)) {
         wasm_runtime_set_exception(module_inst, "out of bounds memory access");
-        return false;
+        return 0;
     }
 
     ctx.str = str;

core/shared/platform/esp-idf/espidf_memmap.c

@@ -59,6 +59,12 @@ os_mmap(void *hint, size_t size, int prot, int flags, os_file_handle file)
     }
 }
 
+void *
+os_mremap(void *old_addr, size_t old_size, size_t new_size)
+{
+    return os_mremap_slow(old_addr, old_size, new_size);
+}
+
 void
 os_munmap(void *addr, size_t size)
 {

core/shared/platform/esp-idf/espidf_platform.c

@@ -234,7 +234,7 @@ unlinkat(int fd, const char *path, int flag)
 }
 
 int
-utimensat(int fd, const char *path, const struct timespec *ts, int flag)
+utimensat(int fd, const char *path, const struct timespec ts[2], int flag)
 {
     errno = ENOSYS;
     return -1;
@@ -257,7 +257,7 @@ ftruncate(int fd, off_t length)
 #endif
 
 int
-futimens(int fd, const struct timespec *times)
+futimens(int fd, const struct timespec times[2])
 {
     errno = ENOSYS;
     return -1;
@@ -268,4 +268,4 @@ nanosleep(const struct timespec *req, struct timespec *rem)
 {
     errno = ENOSYS;
     return -1;
-}
+}

core/shared/platform/esp-idf/platform_internal.h

@@ -109,6 +109,12 @@ typedef unsigned int korp_sem;
 #define DT_LNK DTYPE_LINK
 #define DT_SOCK DTYPE_SOCK
 
+static inline int
+os_getpagesize()
+{
+    return 4096;
+}
+
 typedef int os_file_handle;
 typedef DIR *os_dir_stream;
 typedef int os_raw_file_handle;