bump stack size to cater for _sre recursion.

reorganise modules, so that most standard extensions are built into
the Python DLL.  this slightly improves performance; reduces
fragmentation of address spaces and slightly reduces memory footprint.
diff --git a/PC/os2emx/Makefile b/PC/os2emx/Makefile
index 265ff0b..1726613 100644
--- a/PC/os2emx/Makefile
+++ b/PC/os2emx/Makefile
@@ -214,7 +214,7 @@
 	@echo Creating .DEF file: $@
 	@echo NAME $(notdir $*) $(EXETYPE.$(notdir $*).exe) >$@
 	@echo DESCRIPTION $(DQUOTE)$(DESCRIPTION.$(notdir $*).exe)$(DQUOTE) >>$@
-	@echo STACKSIZE 1048576 >>$@
+	@echo STACKSIZE 1572864 >>$@
 
 # Output file names
 PYTHON_VER=	2.3