and referencing externs in non-common code to the appropriate modules
- add -DLANG_SPECIFIC_DRIVER for g++ and g77 as required by a "GNU build"
- Cleanup: $() -> ${}
by any cc1 module and breaks a shared libcc1.
- Add first shot at a shared library of libcc1, only turned on if
CC1_SHLIB is set in make's environment. Doesn't yet know how to install
the library without installing the .a files. This is much faster than
you may think, and shares nearly 2MB worth of code between the cc1
modules.
