Bring the example toolchain for i686-rtems4.11 back into sync with
the current PSP and platform build module for this system.

Moves prototype into cfe_sb.h, moves code from private
to the msg_id_util area.  Also added abstracted defines
for packet types.

Adds the unit test stub and updated the standards comments
to reflect the current process.

Use the INTERFACE_COMPILE_DEFINITIONS and INTERFACE_INCLUDE_DIRECTORIES
properties from the osal target and apply them to the entire CFE build.

At this time, the OSAL library build does not use/export these properties
so this is effectively a no-op for the CFE build and can be merged with
no effect.  However, in a future version, the OSAL library will export
these interface properties and this will become important.

OSAL now sets these as UT_COVERAGE_COMPILE_FLAGS, UT_COVERAGE_LINK_FLAGS.
Building and linking the UT executable needs a corresponding update.

Fix #543, Expose CFE_SB_GetPktType

Fix #581, Propagate the OSAL compile definitions to CFE build

Fix #573, Update RTEMS example toolchain

Fix #612, Update coverage compile/link flag options