Relocate alpha from ports to libc

Also fixed the following whitespace nits to satisfy the push:

sysdeps/alpha/alphaev6/memset.S:142: space before tab in indent.
sysdeps/alpha/configure:1: new blank line at EOF.
sysdeps/alpha/fpu/e_sqrt.c:126: space before tab in indent.
sysdeps/alpha/preconfigure:1: new blank line at EOF.
sysdeps/unix/sysv/linux/alpha/syscalls.list:1: new blank line at EOF.

sysdeps/unix/sysv/linux/alpha/sysdep.h

@@ -0,0 +1,95 @@
+/* Copyright (C) 1992-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _LINUX_ALPHA_SYSDEP_H
+#define _LINUX_ALPHA_SYSDEP_H 1
+
+#ifdef __ASSEMBLER__
+#include <asm/pal.h>
+#include <alpha/regdef.h>
+#endif
+
+/* There is some commonality.  */
+#include <sysdeps/unix/alpha/sysdep.h>
+
+#include <tls.h>
+
+/* For Linux we can use the system call table in the header file
+	/usr/include/asm/unistd.h
+   of the kernel.  But these symbols do not follow the SYS_* syntax
+   so we have to redefine the `SYS_ify' macro here.  */
+#undef SYS_ify
+#define SYS_ify(syscall_name)	__NR_##syscall_name
+
+/* Define some aliases to make automatic syscall generation work
+   properly.  The SYS_* variants are for the benefit of the files in
+   sysdeps/unix.  */
+#define __NR_getpid	__NR_getxpid
+#define __NR_getuid	__NR_getxuid
+#define __NR_getgid	__NR_getxgid
+#define SYS_getpid	__NR_getxpid
+#define SYS_getuid	__NR_getxuid
+#define SYS_getgid	__NR_getxgid
+
+/*
+ * Some syscalls no Linux program should know about:
+ */
+#define __NR_osf_sigprocmask	 48
+#define __NR_osf_shmat		209
+#define __NR_osf_getsysinfo	256
+#define __NR_osf_setsysinfo	257
+
+/* Help old kernel headers where particular syscalls are not available.  */
+#ifndef __NR_semtimedop
+# define __NR_semtimedop	423
+#endif
+
+/* This is a kludge to make syscalls.list find these under the names
+   pread and pwrite, since some kernel headers define those names
+   and some define the *64 names for the same system calls.  */
+#if !defined __NR_pread && defined __NR_pread64
+# define __NR_pread __NR_pread64
+#endif
+#if !defined __NR_pwrite && defined __NR_pwrite64
+# define __NR_pwrite __NR_pwrite64
+#endif
+
+/*
+ * In order to get the hidden arguments for rt_sigaction set up
+ * properly, we need to call the assembly version.  This shouldn't
+ * happen except for inside sigaction.c, where we handle this
+ * specially.  Catch other uses and error.
+ */
+
+#undef INLINE_SYSCALL
+#define INLINE_SYSCALL(name, nr, args...)				\
+({									\
+	extern char ChEcK[__NR_##name == __NR_rt_sigaction ? -1 : 1]	\
+	  __attribute__((unused));					\
+	INLINE_SYSCALL1(name, nr, args);				\
+})
+
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL(name, err_out, nr, args...)			\
+({									\
+	extern char ChEcK[__NR_##name == __NR_rt_sigaction ? -1 : 1]	\
+	  __attribute__((unused));					\
+	INTERNAL_SYSCALL1(name, err_out, nr, args);			\
+})
+
+#endif /* _LINUX_ALPHA_SYSDEP_H */