only build 32bit osx on build server. Catalina doesn't support building 32bit...

only build 32bit osx on build server. Catalina doesn't support building 32bit so we don't want to do this by default anymore.

external/buildscripts/build_all_osx.pl

@@ -52,9 +52,11 @@ GetOptions(
 );
 
 my $monoArch32Target = "i386";
-
-print(">>> Building $monoArch32Target\n");
-system("perl", "$buildscriptsdir/build.pl", "--arch32=1", "--clean=1", "--classlibtests=0", @passAlongArgs) eq 0 or die ("failing building $monoArch32Target");
+if ($buildMachine)
+{
+	print(">>> Building $monoArch32Target\n");
+	system("perl", "$buildscriptsdir/build.pl", "--arch32=1", "--clean=1", "--classlibtests=0", @passAlongArgs) eq 0 or die ("failing building $monoArch32Target");
+}
 
 if ($artifactsCommon)
 {
@@ -80,7 +82,7 @@ if ($artifact)
 
 	system("mkdir -p $embedDirDestination");
 
-	if (!(-d $embedDirSource32))
+	if (!(-d $embedDirSource32) && $buildMachine)
 	{
 		die("Expected source directory not found : $embedDirSource32\n");
 	}