Fix libc-abis handling for MIPS

[Joseph S. Myers]

I've applied this patch to update the libc-abis files for libc changes to 
how they are found in add-ons.  Now there is a MIPS-specific file (in 
which only definitions relevant to MIPS need go) rather than one shared by 
ports; all other ports will just get the libc copy and not need any ports 
changes when the libc copy changes.

Index: libc-abis
===================================================================
--- libc-abis	(revision 10246)
+++ libc-abis	(working copy)
@@ -1,16 +0,0 @@
-# See the copy of this file in libc for detailed explanations.  The
-# ports copy needs to include all libc definitions applicable to any
-# ports target; only one copy will be used.
-#
-# Feature Name	Configuration
-# ------------	-------------
-#
-# MIPS PLTs.
-MIPS_PLT	mips*-*-linux*
-#
-# Unique symbol definitions for C++.
-# Architecture independent, all ELF targets (== all targets)
-UNIQUE
-#
-# Indirect PLT relocations.  Architecture dependent.
-IFUNC		powerpc-*-linux*
Index: sysdeps/unix/sysv/linux/mips/libc-abis
===================================================================
--- sysdeps/unix/sysv/linux/mips/libc-abis	(revision 0)
+++ sysdeps/unix/sysv/linux/mips/libc-abis	(revision 0)
@@ -0,0 +1,13 @@
+# See the copy of this file in libc for detailed explanations.  This
+# copy needs to include all libc definitions applicable to MIPS; only
+# one copy will be used.
+#
+# Feature Name	Configuration
+# ------------	-------------
+#
+# MIPS PLTs.
+MIPS_PLT	mips*-*-linux*
+#
+# Unique symbol definitions for C++.
+# Architecture independent, all ELF targets (== all targets)
+UNIQUE

-- 
Joseph S. Myers
joseph@codesourcery.com