feat: add support for compiling open/r on 64-bit arm linux (#95)

Summary:
Description:

Prior to this patch it was not possible to run open/r on linux running on ARM due to cmake and openssl being harded to download/compile for the x86_64 arch.

In order to prevent such problem this patch actively compiles cmake instead of using pre-compiled binaries and also allows the OpenSSLBuilder to provide the correct build args to openssl, thus not trying to compile or run x86_64 software.

Pull Request resolved: https://github.com/facebook/openr/pull/95

Test Plan: * built the project by using ./build/build_openr.sh

Reviewed By: wez

Differential Revision: D28224684

Pulled By: cooperlees

fbshipit-source-id: 9de61dc6d7dcf7116ec5c67f3f165cd4a4bb5e5c

build/fbcode_builder/getdeps/platform.py

@@ -5,6 +5,7 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 
+import platform
 import re
 import shlex
 import sys
@@ -70,10 +71,18 @@ class HostType(object):
         self.distro = distro
         # The OS/distro version if known
         self.distrovers = distrovers
+        machine = platform.machine().lower()
+        if "arm" in machine or "aarch" in machine:
+            self.isarm = True
+        else:
+            self.isarm = False
 
     def is_windows(self):
         return self.ostype == "windows"
 
+    def is_arm(self):
+        return self.isarm
+
     def is_darwin(self):
         return self.ostype == "darwin"