NODE: fix node build on osx for node 4 & 6
On OSX, node 4 and node 6 do not compile with C++11 by default.
Needed to add xcode_settings to force C++11 compilation to allow
for smart pointers
'sources': [
'src/mongocrypt.cc'
],
+ 'xcode_settings': {
+ 'OTHER_CFLAGS': [
+ "-std=c++11",
+ "-stdlib=libc++",
+ "-mmacosx-version-min=10.12"
+ ],
+ },
'conditions': [
['build_type=="dynamic"', {
'link_settings': {
