stage2: linking with LLD and building glibc static CRT files

 * implement --debug-cc and --debug-link
 * implement C source files having extra flags
   - TODO a way to pass them on the CLI
 * introduce the Directory abstraction which contains both an open file
   descriptor and a file path name. The former is preferred but the
   latter is needed when communicating paths over a command line (e.g.
   to Clang or LLD).
 * use the cache hash to choose an artifact directory
   - TODO: use separate cache hash instances for the zig module and
     each C object
 * Module: introduce the crt_files table for keeping track of built libc
   artifacts for linking.
 * Add the ability to build 4/6 of the glibc static CRT lib files.
 * The zig-cache directory is now passed as a parameter to Module.
 * Implement the CLI logic of -femit-bin and -femit-h
   - TODO: respect -fno-emit-bin
   - TODO: the emit .h feature
 * Add the -fvalgrind, -fstack-check, and --single-threaded CLI options.
 * Implement the logic for auto detecting whether to enable PIC,
   sanitize-C, stack-check, valgrind, and single-threaded.
 * Properly add PIC args (or not) to clang argv.
 * Implement renaming clang-compiled object files into their proper
   place within the cache artifact directory.
   - TODO: std lib needs a proper higher level abstraction for
     std.os.renameat.
 * Package is cleaned up to use the "Unmanaged" StringHashMap and use the
   new Directory abstraction.
 * Clean up zig lib directory detection to make proper use of directory
   handles.
 * Linker code invokes LLD.
   - TODO properly deal with the stdout and stderr that we get from it
     and expose diagnostics from the Module API that match the expected
     error message format.
 * Delete the bitrotted LLVM C ABI bindings. We'll resurrect just the
   functions we need as we introduce dependencies on them. So far it
   only has ZigLLDLink in it.
 * Remove dead timer code.
 * `zig env` now prints the path to the zig executable as well.

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