accept "-n THREADNUMBER" in OvmfPkg build script

v1->v2:
- change from "-j JOBS"

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13521 6f19259b-4bc3-4df7-8a09-765794883524
MU SOURCE COMMIT:578630802ee5b38cb19894c4944261afa4d92c17

Platforms/OvmfPkg/build.sh

@@ -45,6 +45,7 @@ PROCESSOR=X64
 BUILDTARGET=DEBUG
 BUILD_OPTIONS=
 PLATFORMFILE=
+THREADNUMBER=1
 LAST_ARG=
 RUN_QEMU=no
 
@@ -89,7 +90,7 @@ for arg in "$@"
 do
   if [ -z "$LAST_ARG" ]; then
     case $arg in
-      -a|-b|-t|-p)
+      -a|-b|-t|-p|-n)
         LAST_ARG=$arg
         ;;
       qemu)
@@ -115,6 +116,9 @@ do
       -t)
         TARGET_TOOLS=$arg
         ;;
+      -n)
+        THREADNUMBER=$arg
+        ;;
       *)
         BUILD_OPTIONS="$BUILD_OPTIONS $arg"
         ;;
@@ -206,6 +210,6 @@ fi
 # Build the edk2 OvmfPkg
 #
 echo Running edk2 build for OvmfPkg$Processor
-build -p $PLATFORMFILE $BUILD_OPTIONS -a $PROCESSOR -b $BUILDTARGET -t $TARGET_TOOLS
+build -p $PLATFORMFILE $BUILD_OPTIONS -a $PROCESSOR -b $BUILDTARGET -t $TARGET_TOOLS -n $THREADNUMBER
 exit $?