Fix executable symlinks.

32 bit targets will leave TARGET_PREFER_{32,64}_BIT_APPS unset
so adjust accordingly. Also clean up an explanatory comment.

Change-Id: I1f6faa640e4e862631fff49f7c565766ef2c567f
Introduce netd_client, a dynamic library that talks to netd.

(cherry picked from commit 440de6b9f715cb18b8ee888c58d5c7a659ff5073)

Change-Id: Ib6198e19dbc306521a26fcecfdf6e8424d163fc9
Merge "Introduce netd_client, a dynamic library that talks to netd."
Support host multilib build

This change basically ported our target multilib to the host side.
It supports 2 host build modes: x86 and x86_64 multilib build.
For now you need to set "BUILD_HOST_64bit=true" to switch to x86_64
multilib build. Later we'll default to x86_64 build and have a flag
to force 32-bit only build, which may be needed by SDK build.

In host module definition, like in target ones, you can use the
following
LOCAL variables to set up multilib configuration:
LOCAL_MULTILIB: can be "both", "first", "32" or "64".
It also supports the same set of arch or 32-vs-64 specific LOCAL
variables.
By default, it builds only for the first arch.

To keep path compatibility, in x86_64 build files are still output to
out/host/linux-x86; Both 32-bit and 64-bit executables are in
out/host/linux-86/bin;
In x86_64 build 32-bit shared libraries are installed to
out/host/linux-x86/lib32
and 64-bit shared libraries are installed to out/host/linux-x86/lib;
32-bit object files are output to out/host/linux-x86/obj32 and 64-bit
object files
are output to out/host/linux-x86/obj.

Bug: 13751317
Change-Id: I6044f83b7db369a33e05209e8c588eb6dc83409f
Merge "Support host multilib build"
Merge "Fix executable symlinks."
auto-merger: merge in from aosp/master

Conflicts:
	core/combo/HOST_darwin-x86.mk
	core/definitions.mk