etiago: Backported this from fornwall's patch.

Without this patch functions such as process.getgroups
are not built on Android, which breaks things such as
npm/node_modules/which/which.js.

diff -u -r ../node-v4.4.3/src/node.cc ./src/node.cc > src-node.cc.patch
--- ../node-v4.4.3/src/node.cc	2016-04-12 19:42:14.000000000 +0000
+++ ./src/node.cc	2016-04-19 07:42:50.984256666 +0000
@@ -74,7 +74,7 @@
 #include <unistd.h>  // setuid, getuid
 #endif
 
-#if defined(__POSIX__) && !defined(__ANDROID__)
+#if defined(__POSIX__)
 #include <pwd.h>  // getpwnam()
 #include <grp.h>  // getgrnam()
 #endif
@@ -1718,7 +1718,7 @@
 }
 
 
-#if defined(__POSIX__) && !defined(__ANDROID__)
+#if defined(__POSIX__)
 
 static const uid_t uid_not_found = static_cast<uid_t>(-1);
 static const gid_t gid_not_found = static_cast<gid_t>(-1);
@@ -2038,7 +2038,7 @@
   }
 }
 
-#endif  // __POSIX__ && !defined(__ANDROID__)
+#endif  // __POSIX__
 
 
 void Exit(const FunctionCallbackInfo<Value>& args) {
@@ -3028,7 +3028,7 @@
 
   env->SetMethod(process, "umask", Umask);
 
-#if defined(__POSIX__) && !defined(__ANDROID__)
+#if defined(__POSIX__)
   env->SetMethod(process, "getuid", GetUid);
   env->SetMethod(process, "geteuid", GetEUid);
   env->SetMethod(process, "setuid", SetUid);
@@ -3042,7 +3042,7 @@
   env->SetMethod(process, "getgroups", GetGroups);
   env->SetMethod(process, "setgroups", SetGroups);
   env->SetMethod(process, "initgroups", InitGroups);
-#endif  // __POSIX__ && !defined(__ANDROID__)
+#endif  // __POSIX__
 
   env->SetMethod(process, "_kill", Kill);