profiles: Move the SYMLINK_LIB=yes setup to a 'lib32' subprofile

Move the custom Gentoo SYMLINK_LIB=yes setup to arch/amd64/lib32
subprofile, making the top profile SYMLINK_LIB=no at the same time.
Update the inheritance tree so that all current profiles switch to
the sub-profile, and remove redundant SYMLINK_LIB=no overrides
in arch/amd64/x32 sub-profile.

profiles/arch/amd64/lib32/make.defaults

@@ -0,0 +1,5 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+LIBDIR_x86="lib32"
+SYMLINK_LIB="yes"

profiles/arch/amd64/lib32/parent

@@ -0,0 +1 @@
+..

profiles/arch/amd64/make.defaults

@@ -18,10 +18,9 @@ DEFAULT_ABI="amd64"
 ABI="amd64"
 
 LIBDIR_amd64="lib64"
-# TODO: move this to a deprecated subprofile
-LIBDIR_x86="lib32"
+LIBDIR_x86="lib"
 LIBDIR_x32="libx32"
-SYMLINK_LIB="yes"
+SYMLINK_LIB="no"
 
 # 64bit specific settings.
 CFLAGS_amd64="-m64"

profiles/arch/amd64/x32/make.defaults

@@ -5,9 +5,6 @@ DEFAULT_ABI="x32"
 ABI="x32"
 MULTILIB_ABIS="amd64 x86 x32"
 
-LIBDIR_x86="lib"
-SYMLINK_LIB="no"
-
 # Michał Górny <mgorny@gentoo.org> (01 Jul 2014)
 # Default to abi_x86_x32 for packages that don't have it forced.
 ABI_X86="x32"

profiles/default/linux/amd64/13.0/parent

@@ -1,3 +1,3 @@
 ..
-../../../../arch/amd64
+../../../../arch/amd64/lib32
 ../../../../releases/13.0

profiles/default/linux/amd64/17.0/parent

@@ -1,3 +1,3 @@
 ..
-../../../../arch/amd64
+../../../../arch/amd64/lib32
 ../../../../releases/17.0

profiles/default/linux/amd64/dev/parent

@@ -1,2 +1,2 @@
 ..
-../../../../arch/amd64
+../../../../arch/amd64/lib32

profiles/hardened/linux/amd64/parent

@@ -1,4 +1,4 @@
 ../../../base
 ../../../default/linux
-../../../arch/amd64
+../../../arch/amd64/lib32
 ..