gyp: use built-in openssl by default

configure

@@ -54,6 +54,11 @@ parser.add_option("--shared-v8-libname",
     dest="shared_v8_libname",
     help="Alternative lib name to link to (default: 'v8')")
 
+parser.add_option("--openssl-use-sys",
+    action="store",
+    dest="openssl_use_sys",
+    help="Use the system OpenSSL instead of one included with Node")
+
 parser.add_option("--openssl-includes",
     action="store",
     dest="openssl_includes",
@@ -201,6 +206,9 @@ def configure_openssl(o):
   if options.no_ssl2:
     o['defines'] += ['OPENSSL_NO_SSL2=1']
 
+  if not options.openssl_use_sys:
+    o['variables']['node_use_system_openssl'] = b(False)
+  else:
     out = pkg_config('openssl')
     (libs, cflags) = out if out else ('', '')