libc: include the right types.h from sys/param.h, arpa/nameser.h and resolv.h

[bird]

sys/param.h and two other headers tcpip includes types.h in order to be compatible with the IBM toolkit. Since types.h is a rather common header name, care must be taken that we don't include the wrong header. This is important since the includes are all inside extern "C" {} and will break if the project types.h makes use of C++ features.

(This was fixed on the trunk in [2991], just test and backport it.)

[bird]

(In [2992]) include the right types.h. Fixes #141.