BaseTools:copy the common PcdValueCommon.c to output directory

BaseTools:copy the common PcdValueCommon.c to output directory

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2568

PcdValueInit shares the same Edk2\BaseTools\Source\C\PcdValueCommon.c.
To avoid the conflict, it should copy this file to its output directory,
If so, PcdValueCommon.c file will be private for PcdValueInit

Cc: Liming Gao <liming.gao@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>