use PlatformDependant macro instead of IF_WINDOWS (because IF_WINDOWS will be changed for linux)

Pm/PmDriver.icl

@@ -382,7 +382,7 @@ step intr (DComp force dircache (AsyncWin [] {win_compiler_process_ids,win_max_n
 	# ps = app_world_instead_of_ps (QuitCleanCompiler True win_compiler_process_ids) ps;
 	# ps					= showInfo (Level1 "Generating...") ps
 	# (paths,ds)			= ds!modpaths
-	= step intr (DGene paths (IF_WINDOWS (ASyncCodeGenerationWin [] win_max_n_processes) SyncCodeGeneration) ds) ps
+	= step intr (DGene paths (PlatformDependant (ASyncCodeGenerationWin [] win_max_n_processes) SyncCodeGeneration) ds) ps
 
 step intr state=:(DComp force _ (Async _ _) _ _) ps
 	# (state, ps)			= check_completed state ps