cherry: camera: Force the server to use old C++ runtime

There's some (there's a lot, actually, run valgrind and try not to cry)
undefined behaviour in our camera blobs that, when combined with the
6.0 era STL, makes them crash when stopping the preview:

pid: 251, tid: 2570, name: mm-qcamera-daem  >>> /system/bin/mm-qcamera-daemon <<<
signal 8 (SIGFPE), code -6 (SI_TKILL), fault addr 0xfb
    r0 00000000  r1 00000a0a  r2 00000008  r3 00000000
    r4 b6480980  r5 00000008  r6 b6480930  r7 0000010c
    r8 b823bd78  r9 00010002  sl b823d5e8  fp 00000001
    ip 00000000  sp b6480038  lr b6e6d745  pc b6e6fea8  cpsr 200f0010

backtrace:
    #00 pc 0004cea8  /system/lib/libc.so (tgkill+12)
    #1 pc 0004a741  /system/lib/libc.so (pthread_kill+36)
    #2 pc 0001b143  /system/lib/libc.so (raise+10)
    #3 pc 00078be0  /system/lib/libc++.so (__aeabi_ldiv0+8)
    #4 pc 00003775  /system/vendor/lib/libmmcamera2_cpp_module.so (cpp_module_set_clock_freq+540)
    #5 pc 00005e27  /system/vendor/lib/libmmcamera2_cpp_module.so (cpp_module_handle_streamoff_event+430)
    #06 pc 00003283  /system/vendor/lib/libmmcamera2_cpp_module.so (cpp_module_process_downstream_event+530)
...

Given the lack of source and the unbisectable mess that is the external/libcxx
git history, ship the prebuilt and renamed 5.1.1 libc++ and preload it
for the server.

Change-Id: Ia7dd6bd47230d24fa3801275c382ebf27939c88f

init.target.rc

@@ -73,6 +73,7 @@ service qcamerasvr /system/bin/mm-qcamera-daemon
     class late_start
     user camera
     group camera system inet input graphics
+    setenv LD_PRELOAD /vendor/lib/libqcamerasvr-c++.so
 
 #enable zram
 on property:ro.config.zram=true

proprietary-files.txt

@@ -57,6 +57,7 @@ vendor/lib/libmmipl.so
 vendor/lib/libmmjpeg.so
 vendor/lib/libmmqjpeg_codec.so
 vendor/lib/liboemcamera.so
+vendor/lib/libqcamerasvr-c++.so
 vendor/lib/libqomx_jpegenc.so
 
 # Camera Actuator