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/alpha/fpu/s_csinf.c

@@ -0,0 +1,50 @@
+/* Return sine of complex float value.
+   Copyright (C) 2004-2014 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/>.  */
+
+#define __csinf __csinf_not_defined
+#define csinf csinf_not_defined
+
+#include <complex.h>
+#include <math.h>
+
+#undef __csinf
+#undef csinf
+#define __csinf internal_csinf
+
+static _Complex float internal_csinf (_Complex float x);
+
+#include <math/s_csinf.c>
+#include "cfloat-compat.h"
+
+#undef __csinf
+
+c1_cfloat_rettype
+__c1_csinf (c1_cfloat_decl (x))
+{
+  _Complex float r = internal_csinf (c1_cfloat_value (x));
+  return c1_cfloat_return (r);
+}
+
+c2_cfloat_rettype
+__c2_csinf (c2_cfloat_decl (x))
+{
+  _Complex float r = internal_csinf (c2_cfloat_value (x));
+  return c2_cfloat_return (r);
+}
+
+cfloat_versions (csinf);