Rework older conda packages

[mithro]

Make the conda packages use the new Jinja templating for package creation. Original package variants where attempted but ended up falling back to just using environment variables.

All packages should be green again now. The cross compilers are back to not being statically linked, instead they are built with the conda toolchain.

This should fix;

• Replace conda-multisrc-example with in built support #22 - Replace conda-multisrc-example with in built support
• Create a TimVideos specific "constructor" #21 - Create a TimVideos specific "constructor"
• Create a fix for conda-build 3.0 removing __conda_version__ support. #15 - Create a fix for conda-build 3.0 removing conda_version support.
• Issue with vsyscall causing segfaults (see Due to glibc 2.12 limitation, static executables that use time(), cpuinfo() and maybe a few others cannot be run on systems that do not support or use vsyscall=emulate ContinuumIO/anaconda-issues#8203)
• Issue with NLS causing segfaults (when using newlib version with FuPy).

For git based packages, the build string / number is as follows;

# y==GIT_DESCRIBE_NUMBER, z==DATESTR, x==GIT_DESCRIBE_HASH
#
# number: 10693001803050325
#         1yyyy00zzzzzzzzzz
number: {{ '1%04i00%s'|format(environ.get('GIT_DESCRIBE_NUMBER')|int, environ.get('DATESTR')) }}
# string: 0693.1803050325.g588ce0e3
#         yyyy.zzzzzzzzzz.gxxxxxxxx
string: {{ '%04i'|format(environ.get('GIT_DESCRIBE_NUMBER')|int) }}.{{ environ.get('DATESTR') }}.{{ environ.get('GIT_DESCRIBE_HASH', 'unknown') }}

For source repos the build string / number is as follows;

# z==DATESTR
#
# number: 1803050325
#         zzzzzzzzzz
number: {{ environ.get('DATESTR') }}
# string: 0693.1803050325.g588ce0e3
#         yyyy.zzzzzzzzzz.gxxxxxxxx
string: {{ environ.get('DATESTR') }}