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/dl-auxv.h

@@ -0,0 +1,35 @@
+/* Auxiliary vector processing for Linux/Alpha.
+   Copyright (C) 2007-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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/>.  */
+
+/* Scan the Aux Vector for the cache shape entries.  */
+
+extern long __libc_alpha_cache_shape[4];
+
+#define DL_PLATFORM_AUXV				\
+      case AT_L1I_CACHESHAPE:				\
+	__libc_alpha_cache_shape[0] = av->a_un.a_val;	\
+	break;						\
+      case AT_L1D_CACHESHAPE:				\
+	__libc_alpha_cache_shape[1] = av->a_un.a_val;	\
+	break;						\
+      case AT_L2_CACHESHAPE:				\
+	__libc_alpha_cache_shape[2] = av->a_un.a_val;	\
+	break;						\
+      case AT_L3_CACHESHAPE:				\
+	__libc_alpha_cache_shape[3] = av->a_un.a_val;	\
+	break;