CParser multi_arch_refactor: build standalone parser in dir named after arch

Architecture names follow L4V_ARCH-style naming conventions ('ARM', 'FAKE64').
However, the standalone parser does not make use of the L4V_ARCH environment
variable.

The standalone-parser Makefile builds all architectures at once, producing
binaries at 'ARM/c-parser', 'FAKE64/c-parser', and similarly for the tokenizer.

There are also wrapper scripts 'c-parser' and 'tokenizer' in the
standalone-parser directory, which take an architecture on the command line.

The make_munge.sh script calls the appropriate binary parser directly.

CParser multi_arch_refactor: fix tokenizer build