The calls have not been updated as the CI target has been.

This is required for generating documentation

Depending on the CMake version when we are configuring it emits a
warning about deprecation of CMAKE_FORCE_CXX_COMPILER. However we
rely on this macro and don't want to do what CMAKE_CXX_COMPILER
is doing. Here is what I get with CMake 3.9.1:

	CMake Deprecation Warning at /usr/share/cmake/Modules/CMakeForceCompiler.cmake:83 (message):
	  The CMAKE_FORCE_CXX_COMPILER macro is deprecated.  Instead just set
	  CMAKE_CXX_COMPILER and allow CMake to identify the compiler.
	Call Stack (most recent call first):
	  cmake/toolchains/Toolchain-arm-none-eabi.cmake:37 (cmake_force_cxx_compiler)
	  /usr/share/cmake/Modules/CMakeDetermineSystem.cmake:94 (include)
	  CMakeLists.txt:263 (project)

Avoid the warning by passing -Wno-deprecated to cmake.

* NuttX cmake

* px4_macros:Pass the stringified predicate as second arg to static assert

   CC_ASSERT mapes to the c++ static_assert or provides the same
   funtionality for c via the other macros. The c++ static assert
   takes 2 argumants the prdicate and a message. This fixes the
   lacking second argument.

* Updated nuttx and apps submodule to upstream nuttx 7.21+==master

   This is the latest uptake of upstream nuttx and apps.

* ROMFS generate with xxd instead of objcopy

* delete nuttx-patches

* NuttX update submodules to latest px4_nuttx-master

* fix nuttx apps and board dependency

* docker_run update to latest container 2017-08-29

* cmake ROMFS portable sed usage

* NuttX update submodules to latest px4_nuttx-master

   Superceeded by nxphlite-v3 before released

* Makefile target "check_stack"