Update Ruby 1.9.3 to patchlevel 550

Results of `make check`:
https://gist.github.com/luislavena/39f2ef26142787c2cd43
Really silence curl uploads
Generate both MD5 and SHA256

Because having one verification mechanism is not enough.
Really silence curl output

Is not enough silence the request but also the output once it
completes.
Upgrade Ruby 2.0.0 to patchlevel 594

Results of `make check`:
https://gist.github.com/luislavena/158e62fa447176594ccc
Upgrade Ruby 2.1 to version 2.1.4

Results of `make check`:
https://gist.github.com/luislavena/5160fe07c688c37f8e61
Add mingw64 4.8.2-rev0 x86 and x64 support
Only add DLDFLAGS for relevant DevKit's

Current GCC 4.8.x compilers add an implicit dependency to the libgcc
support library to msvcrt-rubyXYZ.dll. This overly complicates
installs and creates additional support concerns. Adding -static-libgcc
to configure's DLDFLAGS "fixes" this GCC behavior. Rather than
hard-coding DLDFLAGS for every build, set only when appropriate.

NOTE: while generic to 4.8.x, the DevKit version matching regex must
be updated to support future GCC versions if this GCC behavior persists.
Upgrade mingw64-{32,64}-4.8.2 to rev 1
Update mingw64-{32,64}-4.8.2 to rev2
Update mingw64-{32,64}-4.8.2 to rev3
Update mingw64-{32,64}-4.8.2 to rev4
Add mingw64-{32,64}-4.9.0 rev1 support
Use msys2(32bit) instead of old msys

Parallel make hangs due to msys bug.
http://sourceforge.net/p/mingw/bugs/1950/

msys2 is updated version of msys and the bug seems to be fixed.
http://mingw-users.1079350.n2.nabble.com/Status-of-MSYS2-td7582391.html

We pick up msys2 minimal dependencies to build ruby.
Need to set MSYSTEM=MINGW32 environment variable.

Default value of MSYSTEM is changed with msys2.
http://sourceforge.net/p/msys2/tickets/4/
Pass make options by MAKE_OPT environment variable

We can pass -jN to make for build speedup.
Replace mingw/gnuwin32 packages to msys2
Add missing host option of x86_64 build
Add patch to MSYS2 based DevKit

The MSYS2 based patch utility embeds the manifest required to
prevent UAC issues on Windows systems.
Update mingw64-{32,64}-4.9.0 to rev2