Switch devenv to use pkg packages

lib/naclports/bsd_pkg.py

 # Copyright 2015 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Basic implemenation of FreeBSD pkg file format.
 
 This is just enough to allow us to create archive files
 that pkg will then be able to install.
 
 See https://github.com/freebsd/pkg#pkgfmt for information
@@ skipping 110 matching lines @@
     pkg_info_file = os.path.join(paths.NACLPORTS_ROOT,
                                  subdir, dep, 'pkg_info')
 
     if os.path.exists(pkg_info_file):
       dep_dict['version'] = package.Package(info_file=pkg_info_file).VERSION
       return
 
   raise Error("Package not found: %s" % dep)
 
 
+# These packages are are built-time only depednecies and we won't want
+# encode them into the pkg file deps.
+BUILD_ONLY_DEPS = [
+  'glibc-compat',
+  'libtar',
+  'python-host',
+  'gmp',
+  'mpfr',
+  'mpc',
+]
+
 def CreateDependencies(depends_dict, depends):
   for dep in depends:
-    if dep != 'glibc-compat':
-      dep_dict = collections.OrderedDict()
-      AddPackageDep(dep_dict, dep)
-      depends_dict[dep] = dep_dict
+    if dep in BUILD_ONLY_DEPS:
+      continue
+    dep_dict = collections.OrderedDict()
+    AddPackageDep(dep_dict, dep)
+    depends_dict[dep] = dep_dict
 
 
 def CreatePkgFile(name, version, arch, payload_dir, outfile, depends):
   """Create an archive file in FreeBSD's pkg file format"""
   util.Log('Creating pkg package: %s' % outfile)
   manifest = collections.OrderedDict()
   manifest['name'] = name
   manifest['version'] =  version
   manifest['arch'] = 'nacl:0:%s' % arch
 
@@ skipping 28 matching lines @@
     for filename in os.listdir(temp_dir):
       if filename.startswith('+'):
         fullname = os.path.join(temp_dir, filename)
         tar.add(fullname, arcname=filename)
 
     for filename in os.listdir(temp_dir):
       if not filename.startswith('+'):
         fullname = os.path.join(temp_dir, filename)
         AddFilesInDir(fullname, tar, temp_dir)
   shutil.rmtree(temp_dir)