Fix several issues found (#1996)

- CMakeLists.txt: add lib_export.h to install list
- Fast JIT: enlarge spill cache size to enable several standalone cases
                when hw bound check is disabled
- Thread manager: wasm_cluster_exit_thread may destroy an invalid
               exec_env->module_inst when exec_env was destroyed before
- samples/socket-api: fix failure to run timeout_client.wasm
- enhance CI build wasi-libc and sample/wasm-c-api-imports CMakeLlist.txt

samples/socket-api/README.md

@@ -121,7 +121,7 @@ Shuting down
 ```
 
 ```bash
-$ ./iwasm --addr-pool=127.0.0.1/15 --heap-size=10000000 timeout_client.wasm
+$ ./iwasm --addr-pool=127.0.0.1/15 timeout_client.wasm
 ```
 
 The output is:

samples/socket-api/wasm-src/CMakeLists.txt

@@ -54,7 +54,9 @@ function(COMPILE_WITH_CLANG SOURCE_FILE)
   target_link_options(${MAIN_TARGET_NAME} PRIVATE
     LINKER:--export=__heap_base
     LINKER:--export=__data_end
-    LINKER:--shared-memory,--max-memory=196608
+    LINKER:--export=malloc
+    LINKER:--export=free
+    LINKER:--shared-memory,--max-memory=10485760
     LINKER:--no-check-features
     LINKER:--allow-undefined
   )

samples/wasm-c-api-imports/CMakeLists.txt

@@ -56,10 +56,15 @@ if (NOT CMAKE_BUILD_TYPE)
   set (CMAKE_BUILD_TYPE Release)
 endif ()
 
-set(WAMR_BUILD_AOT 1)
-set(WAMR_BUILD_INTERP 0)
+if (NOT DEFINED WAMR_BUILD_AOT)
+  # Enable AOT by default.
+  set (WAMR_BUILD_AOT 1)
+endif ()
+if (NOT DEFINED WAMR_BUILD_INTERP)
+    # Disable Interpreter by default
+  set (WAMR_BUILD_INTERP 0)
+endif ()
 set(WAMR_BUILD_JIT 0)
-
 set(WAMR_BUILD_FAST_INTERP 1)
 set(WAMR_BUILD_LIB_PTHREAD 1)
 set(WAMR_BUILD_LIBC_BUILTIN 1)