添加rtthread相关代码

riscv/rtthread/components/drivers/ipc/SConscript

@@ -0,0 +1,13 @@
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c')
+CPPPATH = [cwd + '/../include']
+
+if not GetDepend('RT_USING_HEAP'):
+    SrcRemove(src, 'dataqueue.c')
+    SrcRemove(src, 'pipe.c')
+
+group = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_DEVICE_IPC'], CPPPATH = CPPPATH, LOCAL_CPPDEFINES=['__RT_IPC_SOURCE__'])
+
+Return('group')