Update mingw64-32-4.7.1 artifacts
Update mingw64-32-4.7.1 for stealth file rename :(
Use GDBM from Knapsack packages
Update mingw64-32-4.7.1 artifacts
Migrate PDCurses recipe to use Knapsack package
Allow cleanup when building Ruby

This helps our CI environment to workaround issues with some internal
changes in Ruby that fails to generate new files.
Upgrade Tcl/Tk to version 8.5.12

Real monkeys hand edit old patch files. Lazy monkeys start working
on Tcl/Tk binary builds.
Decreased file descriptors for 1.9.x to 2K

Ruby associates a file descriptor to each socket, so can't use more than
2048 even if we force FD_SETSIZE to a bigger value.

This closes #104 (again)
Upgrade specific DevKit's to GDB version 7.5
Updated mingw64-32-4.7.1 support
Enable ruby x64 build

Ruby build works with tdm-64-4.6.1. Knapsack x64 packages are downloaded.
This adds host option to ruby configure for x64.
Update tcl recipe for x64

`make test` of tcl has failures with pow(). I added a patch to use
powl() instead of broken pow().
Set knapsack x64 files in config
Replace tcl/tk recipes with knapsack
No longer requires custom options for Tcl/Tk

Now that package is provided from Knapsack, it will automatically find it
in the PATH.
Document changes from merges
Correct sequence in History file

The described command was out of sequence with the other item.
Refactor GCC 4.7.1 based DevKit's. Closes #130
Add 64bits GCC 4.7.1 (mingw-w64 rubenvb's build)
Add doco miss for new 64bit GCC 4.7.1 DevKit