more #ifdefs and a new source file that contains a single function. Nuke the #if 0 code that is now a macro and move the single function in evp_acnf.c to c_all.c, which is where the other code lives. While here, tidy evp.h slightly, remove an unnecessary #ifdef __OpenBSD__ and nuke a comment that is now a lie. ok miod@OPENBSD_5_6