BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=1672
The /MP option of MSVC compiler can reduce the total time to compile the
source files on the command line.
This patch is going to enable this MSVC option in BaseTools.
Cc: Bob Feng <bob.c.feng@intel.com> Cc: Liming Gao <liming.gao@intel.com> Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com> Reviewed-by: Bob Feng <bob.c.feng@intel.com>