Debug facilities:
- add a framework to easily add new ones
- add gdb as a first debug facility
- add patches for gdb
After the kernel checked its installed headers, clean up the mess of .checked.* files.
Reorder scripts/crosstool.sh:
- dump the configuration early
- renice early
- get info about build system early, when setting up the environment
- when in cross or native, the host tools are those of the build system, and only in this case
- elapsed time calculations moved to scripts/functions
Remove handling of the color: it's gone once and for all.
Update tools/addToolVersion.sh:
- handle debug facilities
- commonalise some code
- remove dead tools (cygwin, tcc)
Point to my address for bug reports.

 --- orig/Makefile.in	2004-05-12 18:22:30.000000000 -0700

 +++ binutils-2.14.90.0.5/Makefile.in	2004-05-12 18:26:19.000000000 -0700

 @@ -24384,6 +24384,8 @@

  # Demangler depends on libiberty.

  configure-demangler: maybe-configure-libiberty

  all-demangler: maybe-all-libiberty

 +configure-build-demangler: maybe-configure-build-libiberty

 +all-build-demangler: maybe-all-build-libiberty

  # The new demangler, which is included in libiberty, is written in C++.

  # A working C++ compiler is required. For the target demangler, it may