wmakeLnIncludeAll: When running parallel wait for the wmakeLnInclude jobs to complete

then synchronize the file system to ensure all links are flushed before
compilation starts

wmake/wmakeLnIncludeAll

@@ -139,6 +139,16 @@ do
     done
 done
 
+if [ "$nCores" -gt 0 ]
+then
+    # Wait for all of the wmakeLnInclude jobs to finish
+    wait
+
+    # Synchronize the file system to ensure that all of the links exist
+    # before compilation
+    sync
+fi
+
 
 #------------------------------------------------------------------------------
 # Cleanup local variables and functions