Fix windows build error and compilation warnings (#3095)

Fix wamrc build error reported on Windows:
```bash
CMake Error at CMakeLists.txt:84 (message):
  Unsupported CMAKE_HOST_SYSTEM_PROCESSOR AMD64
```
And clear several compilation warnings.

Author: wenyongh

core/iwasm/common/wasm_c_api.c

@@ -1934,8 +1934,8 @@ wasm_frame_vec_clone_internal(Vector *src, Vector *out)
         return;
     }
 
-    bh_memcpy_s(out->data, src->num_elems * sizeof(WASMCApiFrame), src->data,
-                src->num_elems * sizeof(WASMCApiFrame));
+    bh_memcpy_s(out->data, (uint32)(src->num_elems * sizeof(WASMCApiFrame)),
+                src->data, (uint32)(src->num_elems * sizeof(WASMCApiFrame)));
     out->num_elems = src->num_elems;
 }
 
@@ -2962,8 +2962,10 @@ wasm_func_new_basic(wasm_store_t *store, const wasm_functype_t *type,
     if (!(func->type = wasm_functype_copy(type))) {
         goto failed;
     }
-    func->param_count = func->type->params->num_elems;
-    func->result_count = func->type->results->num_elems;
+    /* func type's param_count and result_count were checked in
+       loader and are no larger than UINT16_MAX */
+    func->param_count = (uint16)func->type->params->num_elems;
+    func->result_count = (uint16)func->type->results->num_elems;
 
     RETURN_OBJ(func, wasm_func_delete)
 }
@@ -2994,8 +2996,10 @@ wasm_func_new_with_env_basic(wasm_store_t *store, const wasm_functype_t *type,
     if (!(func->type = wasm_functype_copy(type))) {
         goto failed;
     }
-    func->param_count = func->type->params->num_elems;
-    func->result_count = func->type->results->num_elems;
+    /* func type's param_count and result_count were checked in
+       loader and are no larger than UINT16_MAX */
+    func->param_count = (uint16)func->type->params->num_elems;
+    func->result_count = (uint16)func->type->results->num_elems;
 
     RETURN_OBJ(func, wasm_func_delete)
 }
@@ -3085,8 +3089,10 @@ wasm_func_new_internal(wasm_store_t *store, uint16 func_idx_rt,
     if (!func->type) {
         goto failed;
     }
-    func->param_count = func->type->params->num_elems;
-    func->result_count = func->type->results->num_elems;
+    /* func type's param_count and result_count were checked in
+       loader and are no larger than UINT16_MAX */
+    func->param_count = (uint16)func->type->params->num_elems;
+    func->result_count = (uint16)func->type->results->num_elems;
 
     /* will add name information when processing "exports" */
     func->store = store;

wamr-compiler/CMakeLists.txt

@@ -59,30 +59,31 @@ if (DEFINED WAMR_BUILD_AOT_FUNC_PREFIX)
 endif ()
 
 if (NOT WAMR_BUILD_TARGET)
-  if (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64")
+  string(TOLOWER "${CMAKE_HOST_SYSTEM_PROCESSOR}" HOST_SYSTEM_PROCESSOR)
+  if (${HOST_SYSTEM_PROCESSOR} STREQUAL "x86_64")
     set (WAMR_BUILD_TARGET "X86_64")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "i686")
+  elseif (${HOST_SYSTEM_PROCESSOR} STREQUAL "i686")
     set (WAMR_BUILD_TARGET "X86_32")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "amd64")
+  elseif (${HOST_SYSTEM_PROCESSOR} STREQUAL "amd64")
     set (WAMR_BUILD_TARGET "AMD_64")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "aarch64"
-          OR CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "arm64")
+  elseif (${HOST_SYSTEM_PROCESSOR} STREQUAL "aarch64"
+          OR ${HOST_SYSTEM_PROCESSOR} STREQUAL "arm64")
     set (WAMR_BUILD_TARGET "AARCH64")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "arm.*")
+  elseif (${HOST_SYSTEM_PROCESSOR} MATCHES "arm.*")
     message(STATUS "Assuming ${CMAKE_HOST_SYSTEM_PROCESSOR} as ARM_32")
     set (WAMR_BUILD_TARGET "ARM_32")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "mips")
+  elseif (${HOST_SYSTEM_PROCESSOR} STREQUAL "mips")
     set (WAMR_BUILD_TARGET "MIPS_32")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "xtensa")
+  elseif (${HOST_SYSTEM_PROCESSOR} STREQUAL "xtensa")
     set (WAMR_BUILD_TARGET "XTENSA_32")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "riscv64")
+  elseif (${HOST_SYSTEM_PROCESSOR} STREQUAL "riscv64")
     set (WAMR_BUILD_TARGET "RISCV64")
-  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "riscv")
+  elseif (${HOST_SYSTEM_PROCESSOR} STREQUAL "riscv")
     message(STATUS "Assuming ${CMAKE_HOST_SYSTEM_PROCESSOR} as RISCV32")
     set (WAMR_BUILD_TARGET "RISCV32")
   else ()
     message (FATAL_ERROR "Unsupported CMAKE_HOST_SYSTEM_PROCESSOR "
-    "${CMAKE_HOST_SYSTEM_PROCESSOR}")
+	                 "${CMAKE_HOST_SYSTEM_PROCESSOR}")
   endif()
 
   if (WAMR_BUILD_PLATFORM STREQUAL "windows")