sea: add --build-sea to generate SEA directly with Node.js binary

Instead of relying on a WASM build of postject to perform the
injection, add LIEF as dependency and generate the SEA directly
from core via a new CLI option --build-sea which takes the SEA
config. This simplifies SEA generation for users and makes it
easier to debug/maintain the SEA building process.

Author: joyeecheung

LICENSE

@@ -1228,7 +1228,8 @@ The externally maintained libraries used by Node.js are:
     SOFTWARE.
   """
 
-- postject, located at test/fixtures/postject-copy, is licensed as follows:
+- postject, located at test/fixtures/postject-copy and used as a basis for
+  src/node_sea_bin.cc, is licensed as follows:
   """
     Postject is licensed for use as follows:
 

configure.py

@@ -841,6 +841,12 @@
     default=None,
     help='do not install the bundled Amaro (TypeScript utils)')
 
+parser.add_argument('--without-lief',
+    action='store_true',
+    dest='without_lief',
+    default=None,
+    help='build without LIEF (Library for instrumenting executable formats)')
+
 parser.add_argument('--without-npm',
     action='store_true',
     dest='without_npm',
@@ -1710,6 +1716,12 @@ def configure_node(o):
   o['variables']['single_executable_application'] = b(not options.disable_single_executable_application)
   if options.disable_single_executable_application:
     o['defines'] += ['DISABLE_SINGLE_EXECUTABLE_APPLICATION']
+    o['variables']['node_use_lief'] = 'false'
+  else:
+    if (options.without_lief is not None):
+      o['variables']['node_use_lief'] = b(not options.without_lief)
+    else:
+      o['variables']['node_use_lief'] = 'true'
 
   o['variables']['node_with_ltcg'] = b(options.with_ltcg)
   if flavor != 'win' and options.with_ltcg: