[git commit master] test: add API test

[Bernhard Reutner-Fischer]

commit: http://git.uclibc.org/uClibc/commit/?id=d61066fcfe7f00843c4660182ea38ba3a5e41803
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/master

part1; Needs improvement:
Think about a sensible way to map feature sets to the mandated syms.
Our LEGACY stuff maps to OB, OBXSI for example.
A "normal" config should satisfy the BASE (i.e. $foo.SUSv4.syms)

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>

Patch is too large, so refusing to show it