faster to compile.

A small selection of packages was tested going from:

Executed in  696.30 secs   fish           external
   usr time   82.98 mins  395.00 micros   82.98 mins
   sys time    9.02 mins    0.00 micros    9.02 mins

to:

Executed in  592.20 secs   fish           external
   usr time   84.84 mins  361.00 micros   84.84 mins
   sys time    8.85 mins   57.00 micros    8.85 mins

Tested by running make -j 12 and wiping staging/build_dir/target_x

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Added GitHub patch.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Several Makefile cleanups for consistency.

Added ABI_VERSION.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

The soname is not set to the full version, but only major.minor.
This uses libyaml-cpp.so.?.? to try to get it right.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Simpler. Got rid of tests for a faster compile.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Steven Hessing <steven.hessing@gmail.com>