Update versions for cmatrix doxygen elixir erlang eudev fish

Add mc package

Add pre-built binaries for clang (and dependencies), libomxil_bellagio, libxshmfence, lld and llvm (and dependencies)

Update libomxil_bellagio.rb

Allow -j# overrides in lib/package.rb

Update slang to install library files correctly on x86_64 systems

Add maven package

Add gradle package

Add gsl package

* doxygen - added prefix argument to cmake
* elixir  - revert due to ticket #1665
* eudev   - added --libdir argument

[Ticket: #1688 ]

cmartrix - remove redundant depend line

[Ticket: #1688 ]

fish - added --prefix line
eudev - actually rev the package

[Ticket: #1688 ]

Updating packages to versions:
* cmatrix:  version '1.2'
* elixir:  version '1.5.3'
* doxygen:  version '1.8.14'
* erlang:  version '20.2'
* eudev:  version '3.2.5'
* fish:  version '2.7.1'

[Supporting: #1585]

Add slang dependency

Add pre-built binaries for clang (and dependencies), libomxil_bellagio, libxshmfence, lld and llvm (and dependencies)

remove compile option flag -j1 to make it work

Add libaio package

Add description and homepage

Remove environment variable logic

Add pre-built binaries for packages c-w

Update mesa to 17.3.2 (tested on armv7l)

Added a set of formulae for llvm5 and family.

Add dependency libxshmfence for mesa [armv7l]

Rename libomxil_bellagio to libomxil_bellagio.rb

I try to do a clean install of mesa, it shows that it needs libxshmfence.

Add libomxil_bellagio

Update mesa.rb

add --prefix #{CREW_PREFIX} --root #{CREW_DEST_DIR} to pip install