boost: update to 1.67.0

boost: update to 1.67.0

* Remove the backported patch 0001-Fix-a-strange-assert-typo-how-was-this-released-with.patch
* Remove the patch 0002-Don-t-set-up-m32-m64-we-do-that-ourselves.patch
  as it already rewritten gcc to use toolset.flags again
  as below:

  commit 12decb3ce680031b915f69902795eec47224fc7d
  Author: Steven Watanabe <steven@providere-consulting.com>
  Date:   Mon Jan 1 12:51:43 2018 -0700

    Rewrite gcc to use toolset.flags again.
* Remove the hardcoded parallel build limit as the
  mechanism already changed as below commit:
  commit 316e26ca718afc65d6170029284521392524e4f8
  Author: Steven Watanabe <steven@providere-consulting.com>
  Date:   Wed Apr 26 14:22:06 2017 -0600

    Remove fixed limit to -j.  Fixes #189.
    * execunix.c: Replace select with poll.
    * execnt.c: Use RegisterWaitForSingleObject when the number of jobs exceeds MAXIMUM_WAIT_OBJECTS.

Reference: https://github.com/boostorg/build/commit/316e26ca718afc65d6170029284521392524e4f8#diff-c88fe8afebc632d0bef2bd5985137af2

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>