* Makefile.in (NEW_FUNCTIONS): Define target-independent.  Add target
	dependent stuff afterwards.  Globally define timezone and all xdr
	symbols as non-exported from libcygwin.a.
	* Makefile.in (NEW_FUNCTIONS): Add atexit to be not exported.
	* lib/atexit.c (atexit): New, statically linkable version of atexit.
	* dcrt0.cc (cygwin_atexit): Add comment to mark this function as old
	entry point.  Indiscriminately check for DSO of function pointer for
	all functions, if checking for DSO of return address fails on x86_64.
	Change comment accordingly.
*** empty log message ***
	* new-features.xml (ov-new1.7.33): Document xdr and atexit.
	* lib/atexit.c (atexit): Check for being linked into the executable.
	If so, call __cxa_atexit with NULL DSO handle.  Explain why.
	* lib/dso_handle.c: New file providing fallback __dso_handle.
Merge branch 'Cygwin' into develop