* include/gc.h (GC_CreateThread): Declare with WINAPI

	attribute.
	* win32_threads.c (GC_CreateThread): Make definitions consistent
	with declaration.  Cast &thread_table[i].handle to PHANDLE
	in call to DuplicateHandle
	(thread_start): Declare as static.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@69990 138bc75d-0d04-0410-961f-82ee72b054a4