Link atomic library to fix missing undefined referrences
like "undefined reference to `__atomic_fetch_add_8'"

Signed-off-by: Andrej Valek <andrej.valek@siemens.com>

diff -Naur node-v10.15.1/deps/v8/gypfiles/v8.gyp node-v10.15.1/deps/v8/gypfiles/v8.gyp
--- node-v10.15.1/deps/v8/gypfiles/v8.gyp	2019-02-13 09:02:21.000000000 +0100
+++ node-v10.15.1/deps/v8/gypfiles/v8.gyp	2019-02-15 21:27:11.755679660 +0100
@@ -452,6 +452,11 @@
         '<(DEPTH)',
         '<(SHARED_INTERMEDIATE_DIR)'
       ],
+      'link_settings': {
+        'libraries': [
+          '-latomic'
+        ],
+      },
       'sources': [
         '<@(inspector_all_sources)',
         '../include//v8-inspector-protocol.h',