Remove duplicate strcat implementations

Since commit 6e46de42fe16 default strcat implementation is essentially
the same for specialized ia64 and powerpc ones.  This patch removes the
redundant implementation and adjust powerpc64 ifunc code to use the
default one.

Checked on powerpc32-linux-gnu (default and power4) and ia64-linux build
and on powerpc64le-linux-gnu.

	* sysdeps/ia64/strcat.c: Remove file.
	* sysdeps/powerpc/strcat.c: Likewise.
	* sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c: Use default
	C implementation.
	* sysdeps/powerpc/powerpc64/multiarch/strcat-power8.c: Likewise.
	* sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c: Likewise.

4 files changed, 3 insertions, 36 deletions

diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c b/sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c
index ef93a5c6bc..22d2caaec3 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcat-power7.c
@@ -27,4 +27,4 @@ extern typeof (strlen) __strlen_power7;
 
 #define strcpy __strcpy_power7
 #define strlen __strlen_power7
-#include <sysdeps/powerpc/strcat.c>
+#include <string/strcat.c>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcat-power8.c b/sysdeps/powerpc/powerpc64/multiarch/strcat-power8.c
index af4c2f833a..d6e69b1940 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcat-power8.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcat-power8.c
@@ -27,4 +27,4 @@ extern typeof (strlen) __strlen_power7;
 
 #define strcpy __strcpy_power8
 #define strlen __strlen_power7
-#include <sysdeps/powerpc/strcat.c>
+#include <string/strcat.c>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c
index 1bceb6449b..5049fc03f4 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcat-ppc64.c
@@ -26,4 +26,4 @@
 
 extern __typeof (strcat) __strcat_ppc attribute_hidden;
 
-#include <sysdeps/powerpc/strcat.c>
+#include <string/strcat.c>
diff --git a/sysdeps/powerpc/strcat.c b/sysdeps/powerpc/strcat.c
deleted file mode 100644
index 13c64dbac6..0000000000
--- a/sysdeps/powerpc/strcat.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/* strcat version that uses fast strcpy/strlen.
-   Copyright (C) 1997-2017 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/>.  */
-
-#include <string.h>
-
-#ifndef STRCAT
-# undef strcat
-# define STRCAT  strcat
-#endif
-
-/* Append SRC on the end of DEST.  */
-char *
-STRCAT(char *dest, const char *src)
-{
-  strcpy (dest + strlen (dest), src);
-  return dest;
-}
-libc_hidden_builtin_def (STRCAT)