- test for __inline/inline, de-mangle the corresponding hack in
process.c to reduce the diff to NetBSD-current source
- move some autoconf-y bits to configure.ac
fixes build on Solaris with SunPro.
The 'inline' keyword is a nonstandard extension of GCC, AFAIK.
MipsPro does not like it, so remove it.
Add fgetln prototype ifndef HAVE_FGETLN.
This makes this compile on Irix with the MipsPro Compiler as well as gcc.