"Environment checker"

[aytey]

We need to write a utility that verifies that a given VectorCAST/C++ environment is "configured" in a way that "make sense".

Only support GCC for now -- the purpose of this script is provide advice, but the user is welcome to ignore this (e.g., ARM needs --64_bit_target but not --x86_64)

Important things:

• Library stubs

• -m32/-m64 vs. (no args)/--64_bit_target/--x86_64

• Check GCC version against what's being passed to EDG

• Check that we have VCAST_USE_SETLINEBUF

• Check that we have TEST_CASE_TIMEOUT

• Any required CCAST_.CFG options (VCAST_DISPLAY_EMPTY_COVERAGE, VCAST_EMPTY_TESTCASE_FAIL, VCAST_SBF_LIBRARY_STUBS, VCAST_SCRIPT_EXPAND_ARRAYS, VCAST_STRICT_TEST_CASE_IMPORT)

• Bonus points for checking for -ftrack-macro-expansion=0 if you're on a GCC that supports