Describe the bug
Prep fails out of the box when following README instructions:

-- Configuring for system arch: cpu1
-- The C compiler identification is GNU 7.5.0
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- OMIT_DEPRECATED=false: Deprecated elements included in build
Error: "" is not a valid BSP type
CMake Error at /export/home/jhageman/cFS/cFS-GitHub/osal/CMakeLists.txt:66 (message):
  OSAL_SYSTEM_BSPTYPE must be set to the appropriate BSP

To Reproduce
Steps to reproduce the behavior:

1. Follow the README instructions, make prep fails.

Expected behavior
Expected it to default to pc-linux as in the past.

Code snips
The following does not set OSAL_SYSTEM_BSPTYPE since CFE_SYSTEM_PSPNAME and OSAL_SYSTEM_OSTYPE is defined...

System observed on:

• Hardware: cFS Dev Server
• OS: Ubuntu 18.04
• Versions: master bundle

Additional context
Short term work around - pass in SIMULATION=native at prep, or likely can define the target system in targets.cmake (2nd approach not tested yet)

Reporter Info
Jacob Hageman - NASA/GSFC