Merge pull request #9 from metashell/clang_12

Upgrade to Metashell commit 2d691c0568752ced9ef0db5a247274c79e0bbca8

Merge pull request #8 from metashell/clang_11

Upgrade to Metashell commit d13e00c5bd772130647cc7b05e1b356faaa3582c

Upgrade to Metashell commit c68167d4c5cbffc2c9f8aa2f5e06deb3b444aab0

Upgrade to Metashell commit c2fc3868107c5ed95e510a155dc525c095d0c22f

Merge pull request #5 from metashell/clang_601

Upgrade to Clang 6.0.1

Merge pull request #4 from metashell/clang_501

Clang 501

Merge pull request #2 from r0mai/clang-3.8

Clang 3.8

Merge pull request #3 from r0mai/clang-3.8

Clang 3.8 (add missing files)

Archive the files that are used by the CMakeFiles

Set up the build environment in the build script on Ubuntu 12.04