nodejs: cleanup and update

Remove old nodejs4_0.4.12 and update nodejs_0.12.7 to the latest stable
nodejs_4.2.3.

Nodejs is picky about which architectures it supports. The supported arch
mapping required some updating to bring it up to date with the current nodejs
code. Add COMPATIBLE_MACHINE entries so it only builds for the supported
architectures.

ARM cores that don't support at least VFP2 have been dropped:

    https://groups.google.com/forum/#!topic/v8-users/aSOFbaAQvMk

    "Due the increasing cost of the keeping the "no-VFPv2" port of V8 working
    on ARM, we are planning on making 3.17 the last V8 release that that
    supports ARM chips without VFPv2. Starting with the 3.18 release, the
    minimal V8 requirements will increase to ARMv6 + VFPv2. In order to
    simplify maintenance, we will also remove the "pre-VFP2" ARM code from the
    V8 code base."

Additionally, gcc no longer supports a VFPv2 option:

    https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#index-mfpu-1460



Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>