on MacOSX use Sync code generation instead of ASync code generation,

because ASync code generation does not support use of the assembler

Pm/PmDriver.icl

@@ -384,7 +384,7 @@ 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 (ASyncCodeGenerationWin [] win_max_n_processes) ds) ps
+	= step intr (DGene paths (IF_MACOSX SyncCodeGeneration (ASyncCodeGenerationWin [] win_max_n_processes)) ds) ps
 
 step intr state=:(DComp force _ (Async _ _) _ _) ps
 	# ps					= traceInfo (Level3 ["check_completed..."]) ps
@@ -1492,7 +1492,7 @@ where
 					_				-> defaultCO
 	defaultCO	= prefs.compopts
 	(prefs,ps)	= getPrefs ps`
-	
+
 //	Checks whether .o files in the project are out of date.
 CheckABCOutOfDate :: !.Bool !.Pathname !*ABCCache !FileInfoCache !Project !*GeneralSt -> *(*GeneralSt,*ABCCache,FileInfoCache,Bool,Pathname)
 CheckABCOutOfDate sys path abccache fileinfo project ps