improve libc time and MSVC simulator (#5775)

- [libc] 解决由于类unix操作系统发展历史原因fcntl.h定义的标志位在不同编译器中定义不同的问题
- [simulator] 部分宏定义转为全局宏定义以确保vs内置文件可以正确配置
- [simulator] 取消自欺欺人式的警告消除处理方式
- [libc][time] 优化time相关结构体在不同编译器下的包含

components/libc/compilers/common/extension/SConscript

@@ -1,5 +1,5 @@
+import os
 from building import *
-
 Import('rtconfig')
 
 src   = []
@@ -9,6 +9,13 @@ group = []
 
 src += Glob('*.c')
 
-if rtconfig.PLATFORM != 'gcc' or rtconfig.ARCH == 'sim':
+if rtconfig.PLATFORM != 'gcc':
     group = DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH)
+
+list = os.listdir(cwd)
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        group = group + SConscript(os.path.join(d, 'SConscript'))
+
 Return('group')

components/libc/compilers/common/extension/fcntl/README.md

@@ -0,0 +1,4 @@
+Because of the history issue, flags in fcntl.h, such as O_CREAT, have difference types of value. Some OS use hex flags and others use octal flags.
+
+In terms of RT-Thread, Keil, IAR and MSVC use octal flags, which is located in the `tcntl/octal` folder; newlib uses hex flags; musl uses octal flags.
+

components/libc/compilers/common/extension/fcntl/SConscript

@@ -0,0 +1,15 @@
+# RT-Thread building script for bridge
+
+import os
+from building import *
+
+cwd = GetCurrentDir()
+objs = []
+list = os.listdir(cwd)
+
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        objs = objs + SConscript(os.path.join(d, 'SConscript'))
+
+Return('objs')

components/libc/compilers/common/extension/fcntl/octal/SConscript

@@ -0,0 +1,14 @@
+from building import *
+Import('rtconfig')
+
+src   = []
+cwd   = GetCurrentDir()
+CPPPATH = [cwd]
+group = []
+
+if rtconfig.PLATFORM == 'armcc' or\
+   rtconfig.PLATFORM == 'armclang' or\
+   rtconfig.PLATFORM == 'iar' or\
+   rtconfig.CROSS_TOOL == 'msvc':
+    group = DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH)
+Return('group')