BaseTools: Fix the bug of --cmd-len build option

currently the --cmd-len build option does not work.
This patch is going to fix this bug.

Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Reviewed-by: Yuwei Chen <yuwei.chen@intel.com>

BaseTools/Source/Python/AutoGen/DataPipe.py

@@ -148,6 +148,8 @@ class MemoryDataPipe(DataPipe):
 
         self.DataContainer = {"CL_defines": GlobalData.gCommandLineDefines}
 
+        self.DataContainer = {"gCommandMaxLength": GlobalData.gCommandMaxLength}
+
         self.DataContainer = {"Env_Var": {k:v for k, v in os.environ.items()}}
 
         self.DataContainer = {"PackageList": [(dec.MetaFile,dec.Arch) for dec in PlatformInfo.PackageList]}