fix mingw build, still bootstrap issues.

cross_toolset/Makefile

@@ -6,15 +6,6 @@
 SHELL=/usr/bin/env bash
 include ../config_build.mk
 
-#
-# Bootstap
-#
-$(WORKDIR)/bootstrap:
-	@cd $(SRC_ROOT) && ./bootstrap
-	@mkdir -p $(dir $@) && touch $@
-
-bootstrap: $(WORKDIR)/bootstrap
-
 .PHONY : build
 
 build:

solenv/gbuild/extensions/post_BuildplTargets.mk

@@ -177,7 +177,7 @@ dev-install: $(SRCDIR)/src.downloaded $(if $(filter $(INPATH),$(INPATH_FOR_BUILD
 
 build: $(SRCDIR)/src.downloaded $(if $(filter $(INPATH),$(INPATH_FOR_BUILD)),,cross_toolset)
 
-cross_toolset: bootstrap $(SRCDIR)/src.downloaded
+cross_toolset: $(SRCDIR)/src.downloaded
 
 findunusedcode: