BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1923
Fix the issue that the GenFds multi-thread will build fail
if enable the build cache together.
Cc: Liming Gao <liming.gao@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Signed-off-by: Steven Shi <steven.shi@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>
d01a998612