use DirSeparatorString from Platform instead of dirseparator from StdSystem

from Object IO

Pm/PmProject.icl

@@ -6,7 +6,6 @@ import PmPath, UtilStrictLists
 from UtilDate import NoDate, :: DATE
 import UtilNewlinesFile
 import PmTypes
-from StdSystem import dirseparator
 import Platform
 import UtilOptions, PmFiles
 
@@ -105,8 +104,8 @@ PR_NewProject main_module_file_name eo compilerOptions cgo ao prjpaths linkOptio
 	, saved			= False
 	, exec			= False
 	, execpath		= PlatformDependant	//MakeExecPathname main_module_file_name
-						("{Project}"+++{dirseparator}+++modname+++".exe")		// Win
-						("{Project}"+++{dirseparator}+++modname)				// Mac
+						("{Project}"+++DirSeparatorString+++modname+++".exe")		// Win
+						("{Project}"+++DirSeparatorString+++modname)				// Mac
 	, inflist		=
 		{ mn		= modname
 		, info		=	{ dir		= "{Project}"//dirname