[libcpu/risc-v] 修复risc-v scons编译中间文件不能输出到build/kernel/libcpu目录问题 (#5736)

libcpu/risc-v/SConscript

@@ -17,12 +17,12 @@ elif rtconfig.CPU == "nuclei" :
 elif rtconfig.CPU == "virt64" :
     group = group
 else :
-    group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
+    group = group + SConscript(os.path.join('common', 'SConscript'))
 
 # cpu porting code files
 if  rtconfig.CPU == "e9xx" :
-    group = group + SConscript(os.path.join(cwd, rtconfig.VENDOR, rtconfig.CPU, 'SConscript'))
+    group = group + SConscript(os.path.join(rtconfig.VENDOR, rtconfig.CPU, 'SConscript'))
 else :
-    group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+    group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')