Update git submodules

* Update external/lk from branch 'master'
  to f4bba22618b1a0731cb8f34dbebc3c30ab3b97ad
  - [make] Undefine __linux__ macro
    
    The current *-linux-gnu target triples define __linux__
    and some libraries use that macro to detect the OS
    incorrectly for Trusty. We now manually undefine that macro.
    
    Bug: 224064243
    Change-Id: Id809a7fd192cc3434f263a5ef2c09a73835af5fa
    

* Update trusty/user/base from branch 'master'
  to 65c9d37bbd2856ccdc1158be8b72ccf16490e91d
  - Remove MODULE_EXPORT_DEFINES
    
    MODULE_EXPORT_DEFINES is not used anywhere, so we are
    removing it.
    
    Bug: 224644083
    Change-Id: Ia0332d94590e0cff026db81bd1806efa5e69ea9f
    
  - [lib][libstdc++] Define feature flags for libcxx
    
    libcxx uses the __linux__ macro to detect its target OS
    and pick defaults for some of its configuration options.
    Undefining this macro prevents libcxx from detecting the OS
    as Linux, so we now need to specify some of those build
    options manually.
    
    Bug: 224644083
    Change-Id: I3870f17ad9d0903ada4a3985a1e8a3b4b8ff4872
    
2 files changed