libril: Provide support for legacy ril

With change Icc620fd191f8542f61bd38e365813753bfedefdf, RIL_VERSION_MIN was
increased from 2 to 6, but this causes problems for a number of devices
using ril blobs older than that.

  E/RILC    (  140): RIL_register: version 4 is to old, min version is 6

Consequently causing the ril system unable to connect to the rild socket.

Change-Id: I82c1cc4dab8fcaa4ccaa099132133b0f3b1d8029
Fix pthread_create error handling in ril.

Bug: https://code.google.com/p/android/issues/detail?id=64189
Change-Id: Ie6282dda582a574aaad5513c39f2d8d965f6dee3
Stop the kernel complaining about rild.

Even if you're only using capabilities that reside in the bottom 32-bits,
the kernel complains unless you're on __LINUX_CAPABILITY_VERSION_3.

  warning: `rild' uses 32-bit capabilities (legacy support in use)

Change-Id: I6512cbc158971eb950e0fc2554e95fde72023cb2
Remove an outdated hack.

This is still a waste of your main thread, though.

Change-Id: Ic904619b2e1065b2bab577070a73f8175c1a48f3
Fix parameter mismatch between header and implementation

RIL_onUnsolicitedResponse's second parameter is
const void *data
according to include/telephony/ril.h and rild/rild.c, but
void *data
according to libril/ril.cpp

This mismatch causes a compile failure with clang (and I'm surprised
it compiles with gcc with the mismatch - probably gcc parses this as
function overloading even though it's extern "C", which wouldn't do
what is expected).

Change-Id: Ib437040aeca4be43cc2d327c3715ffa98c76878c
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>