* Instance/framework.make: Only copy headers if they changed
Delete framework.dll if the compile fails.
* Instance/subproject.make: Only copy headers if they changed
* Master/framework.make: make $(FRAMEWORK_NAME:=.all.framework.variables) depend
on $(FRAMEWORK_NAME:=.build-headers.framework.variables), sometimes the copying
of header files would happen too late.
* target.make: Added -Wl,--enable-auto-image-base to link command for shared
libs & bundles on mingw32.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/tools/make/trunk@22613 72102866-910b-0410-8b05-ffd578937521