* cygheap.cc (_csbrk): Move down in file, right in front of _cmalloc.
	* pipe.cc (fhandler_pipe::open): Fix format specifier and type when
	reading handle value.
	(fhandler_pipe::get_proc_fd_name): Use same format specifier as in
	fhandler_pipe::open.
	* fhandler_socket.cc (fhandler_socket::get_proc_fd_name): Use %lu as
	format specifier to match HANDLE size.
	* net.cc (cygwin_sendto): Fix return type to be ssize_t.  Change
	syscall_printf return type format specifier to %lR.
	(cygwin_recvfrom): Ditto.
	(cygwin_recv): Ditto.
	(cygwin_send): Ditto.
	(cygwin_recvmsg): Ditto.
	(cygwin_sendmsg): Ditto.
	* smallprint.cc (__small_vsprintf): Handle `l' for %R, too.
	(__small_vswprintf): Ditto.
	* syscalls.cc (read): Change syscall_printf return type format specifier
	to %lR.
	(readv): Ditto.
	(pread): Ditto.
	(write): Ditto.
	(writev): Ditto.
	(pwrite): Ditto.
	(lseek64): Enhance comment.
	* fhandler_socket.cc (fhandler_socket::send_internal): Change type of
	local variable res to ssize_t.
	* net.cc (cygwin_sendto): Fix local variable res, containing return
	value, to be ssize_t as well.
	(cygwin_recvfrom): Ditto.
	(cygwin_recv): Ditto.
	(cygwin_send): Ditto.
	(cygwin_recvmsg): Ditto.
	(cygwin_sendmsg): Ditto.
	* syscalls.cc (write): Ditto.
	(writev): Ditto.
	* pipe.cc (fhandler_pipe::open): Fix type when reading handle value to
	accommodate 32 bit compiler.
	* Throughout fix -Wextra warnings.  Ignore regex files and gmon.c.
Pull in change from HEAD
Merge branch 'cygwin64' into msys2-64-dev