TODO: debloat m4 files

[rofl0r]

there are some m4's that have huge non-sense comments that can be removed

others have huge non-sense configure compiletime checks for 30 year old HP-UX, AIX, etc.

generally it seems that most of what the m4s do is nonsense thats not needed when using a compliant libc. so probably most of the m4 macros could be equipped with an empty body.