Make pire_inline capable of cross-compiling regexps

[dprokoptsev]

Scanner representation is not portable between systems with different byte order and potentially word size; hence once regexp is compiled and inlined, the resulting .cpp must be compiled for the same system where pire_inline had been run. As the result, no cross-compiling is possible.

We need to invent a way to specify target platform capabilities and serialize regexp for that platform.