apps/builtin/exec_builtin.c: Try posix_spawn if builtin apps do not have have an entry point.
apps/Application.mk: introduce MODULE config to simplify tristate(m)
apps/nsh: Change the nuttx shell module type to tristate
apps: Add loadable application support
script/mksymtab: Generate symbol table name by default
apps/builtin: Allow loadable applications can register with apps/builtin.
apps/examples/flowc: Adds the necessary termios controls to enable hardware flow control
apps/examples/flowc: Add a simple test of serial hardware flow control. This commit just defines the frame work. Hardware flow control is not yet enabled.