Pull in changes from HEAD
	* child_info.h (spawn_info): Define asm symbol without leading
	underscore for x86_64.
	(fork_info): Ditto.
	* cygwin.sc.in (__CONCAT1): Define.
	(__CONCAT): Define.
	(_SYM): Define.
	(_data_start__): Define using _SYM macro to accommodate multiple
	platforms.
	(_data_end__): Ditto.
	(_bss_start__): Ditto.
	(_bss_end__): Ditto.
	(_cygheap_start): Ditto.
	(_cygheap_end): Ditto.
	* include/cygwin/config.h (__SYMBOL_PREFIX): Define.
	(_SYMSTR): Define.
	* child_info.h (spawn_info): Use _SYMSTR macro to define assembler
	symbol.
	(fork_info): Ditto.
	* libstdcxx_wrapper.cc: Ditto, throughout.
	* winsup.h (dll_crt0): Ditto.
	* include/cygwin/time.h (daylight): Ditto.
	(timezone): Ditto.
	* lib/_cygwin_crt0_common.cc: Ditto, throughout.
Pull in changes from HEAD