* 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.