Add the dirlinks target to some Makefiles.  This plugs some wholes open by last chicken-and-egg build fix

apps/tools/mkkconfig.sh:  The top-level Kconfig file is not auto-generated.  The autogenerated Kconfig file will be constructed so that every second level directory that contains a Kconfig file will automatically be sourced

Build-server sometimes fails 'make -j24' with:

 In file included from builtin_list.c:62:0:
 builtin_list.h:1:46: error: 'ts_engine_main' undeclared here (not in a function)
  { "ts_engine", SCHED_PRIORITY_DEFAULT, 2048, ts_engine_main },

or sometimes silently succeeds but generates builds that contain
a random subset of configured NuttX applications. There are two
root causes for this:

1) Recipes for building builtin_list.h and builtin_proto.h are not
   linearizable.
2) Nothing ensures that 'make context' is run first for apps/builtin

This patch addresses both issues.

Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>

Add an install target to all makefiles.  For the import build, the top-level Makefile now does two passes: (1) builds libapp.a, then (2) installs the programs (not yet finished)

Beginning of logic that will, hopefully, all me to build applications against a NuttX export package (vs. the nuttx/ source tree).

apps/Makefile should include external/Make.defs so that external applications can participate in the menu configuration

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5455 42af7a65-404d-4744-a932-0658087f49c3

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5454 42af7a65-404d-4744-a932-0658087f49c3

Remove some dependencies of distclean on clean.  This should not be necessary in higher level makefiles and should speed up make distclean

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Simple window natives OS test build now works; Probabaly more to do for other configs; clean targets still have problems

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Change order of includes in apps/Makefile; add clock frequencies to shenzhou, fire, and olimex-stm32 board.h files

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