Rename libv8.so to libv8android.so

Summary:
    On some Android device, there is libv8.so in system ROM.
    E.g. /system/lib/libv8.so or /vendor/lib/libv8.so

    On old Android, dlopen() with RTLD_GLOBAL is not handled well and it's by default RTLD_LOCAL.
    Even we call System.loadLibrary("v8") before,
    during the time RNV8 call System.loadLibrary("v8executor") and search libv8.so in DT_NEEDED.
    It seems bionic linker will use system libv8.so instead of ours.
    Since our libv8.so is customized with libplatform.so, this leads to unresolved symbol as
    Kudo/react-native-v8#29.

    That's why I am proposing to rename libv8.so as libv8android.so and to prevent name conflict from system libv8.so.

    Reference for RTLD_GLOBAL: android/ndk#201

patches/v8_shared_library.patch

@@ -58,8 +58,8 @@ index c486f1a..6aeb762 100644
 @@ -3813,6 +3805,23 @@ v8_static_library("wee8") {
    ]
  }
- 
-+v8_loadable_module("libv8") {
+
++v8_loadable_module("libv8android") {
 +  defines = [ "BUILDING_V8_SHARED" ]
 +
 +  sources = [

scripts/build.sh

@@ -72,12 +72,12 @@ function build_arch()
     if [[ ${MKSNAPSHOT_ONLY} -eq "1" ]]; then
       date ; ninja ${NINJA_PARAMS} -C out.v8.$arch run_mksnapshot_default ; date
     else
-      date ; ninja ${NINJA_PARAMS} -C out.v8.$arch libv8 ; date
+      date ; ninja ${NINJA_PARAMS} -C out.v8.$arch libv8android ; date
 
       mkdir -p $BUILD_DIR/lib/$arch_for_android
-      cp -f out.v8.$arch/libv8.so $BUILD_DIR/lib/$arch_for_android/libv8.so
+      cp -f out.v8.$arch/libv8android.so $BUILD_DIR/lib/$arch_for_android/libv8android.so
       mkdir -p $BUILD_DIR/lib.unstripped/$arch_for_android
-      cp -f out.v8.$arch/lib.unstripped/libv8.so $BUILD_DIR/lib.unstripped/$arch_for_android/libv8.so
+      cp -f out.v8.$arch/lib.unstripped/libv8android.so $BUILD_DIR/lib.unstripped/$arch_for_android/libv8android.so
     fi
 
     mkdir -p $BUILD_DIR/tools/$arch_for_android