[build2] build2 0.10.0 released

[Boris Kolpackov]

Alex Syrnikov <san at masterspline.eu> writes:

> I got https://download.build2.org/0.10.0/build2-toolchain-0.10.0.tar.xz
> 
> but failed to compile.

Fixed and uploaded new build2-toolchain amalgamation. Thanks for the
report!

Note that those who've already installed 0.10.0 via one of the install
scripts don't need to do anything since they've got bdep from the package
which does not have this issue.

Updated SHA256 checksums:

a284d98246b2d2ca8e3e3cb92af5cfeed576b2e3d214710408b70d3dc58694ea *build2-install-0.10.0.sh
f5f86bc5dc178f7cf04b0f0dfdc31362cfc67175b9f878f0ee27075efdf0b600 *build2-install-msvc-0.10.0.bat
20c29a293880e3cf9b3b4967d940869c4558c9d0cbd91b8ae836020c13f4ef44 *build2-install-mingw-0.10.0.bat

d41d516cc09b7d8af877fbd1f279cf36358b33288498131476284232891b8d60 *build2-toolchain-0.10.0.tar.xz
42a254c46b59109b764afade0d50819b3d793a9167f46759fc6aa9d6d8a6ff37 *build2-toolchain-0.10.0.tar.gz