Bug 1420330 - FreeBSD bootstrap: add aarch64 and testing dependencies. r=nalexander

- aarch64 has GNU-free toolchain thus /usr/bin/as is N/A by default
  but GNU as is required to build bundled ICU.
- Downstream Python splits sqlite3 C module into a separate package
  to reduce optional dependencies but _sqlite3 is used by mozprofile.

MozReview-Commit-ID: Lh2ktcqh16f

--HG--
extra : rebase_source : bbcbe437132ecfce0f3e6e7b2005d0e8eac65836

python/mozboot/mozboot/freebsd.py

@@ -3,6 +3,7 @@
 # You can obtain one at http://mozilla.org/MPL/2.0/.
 
 from __future__ import absolute_import
+import sys
 
 from mozboot.base import BaseBootstrapper
 
@@ -19,6 +20,7 @@ class FreeBSDBootstrapper(BaseBootstrapper):
             'gtar',
             'mercurial',
             'pkgconf',
+            'py%s%s-sqlite3' % sys.version_info[0:2],
             'rust',
             'watchman',
             'zip',
@@ -35,6 +37,9 @@ class FreeBSDBootstrapper(BaseBootstrapper):
             'yasm',
         ]
 
+        if not self.which('as'):
+            self.packages.append('binutils')
+
         if not self.which('unzip'):
             self.packages.append('unzip')