Apply changes missing in previous check in.
* cygwin64.din: Fix mangled operator new names for size_t==long.
* libstdcxx_wrapper.cc: Ditto for x86_64.
	For x86_64 target:
	* Makefile.in (COMMON_CFLAGS): Add -mcmodel=small to create smaller
	footprint.
	* cygwin64.din (__cygwin_environ): Drop export.  Only export environ
	as alias to __cygwin_environ.
	* dcrt0.cc (dll_crt0_1): Call main with __cygwin_environ as parameter.
	(_dll_crt0): Don't set main_environ.
	(cygwin_dll_init): Don't create local variable envp and don't set
	user_data->envptr.
	* dll_init.cc (dll_list::alloc): Don't assert.
	* dll_init.h (per_module::operator =): Don't set envptr.
	* environ.cc (cur_environ): Disable.
	* environ.h (main_environ): Don't define.
	(cur_environ): Change to macro.
	* globals.cc (main_environ): Don't initialize.
	(struct per_process): Drop envptr.
	* perprocess.h (SIZEOF_PER_PROCESS): Set to 41*8 to accommodate size
	change of struct per_process.
	* include/sys/cygwin.h (struct per_process): Drop envptr.
	* lib/_cygwin_crt0_common.cc (environ): Drop declaration.
	(_cygwin_crt0_common): Don't set u->envptr.
	For x86_64 target:
	* dll_init.cc (dll::init): Don't set p.envptr.
	(update_envptrs): Disable entirely.
	* dll_init.h (struct per_module): Disable envptr.
	* environ.h (update_envptrs): Change to empty macro.
Pull in change from HEAD
Remove accidentally not removed file.
Pull in changes from HEAD
Pull in changes from HEAD
	* heap.cc (heap_init): Fix setting reserved_size value when using
	ptmalloc3 to avoid too much pagefile pressure at fork time.
	* msg.cc (client_request_msg::serve): Revert change to refuse 64 bit
	processes on 32 bit systems.
	* sem.cc (client_request_sem::serve): Ditto.
	* shm.cc (client_request_shm::serve): Ditto.