Make the following changes for IAR support:
-define __deprecated_message for IAR
-fix python error in iar.py
-move variable length array in buffered serial from cpp file to c file.
IAR only supports variable length arrays in c.
Turn on support for variable length arrays for the IAR C compiler.
This provides greater compatibility with GCC and ARMCC.
Note: The current version of iccarm at the time of this patch
(V7.40.3.8902) does not support variable length arrays in C++.
Support for compiling static libraries via build.py
Support for build.py --no-archive flag which compiles static library as multiple objects
Change default number of jobs when compiling to 0 (auto)
Fix for relative path issue when compiling, which flattened the output whenever absolute path is passed to --build (make.py and build.py)
Fix for temporary files when pre-processing of assembler files with ARMCC
Fix issue with response files where one of the elements is empty string