src/buffer.c: cleanup buffer.c
src/blowfish.c: a small cleanup
src/vimio.h: remove vimio.h which is used for Windows
src/buffer.c: change pre-C99 to C99 style function definition
src/charset.c: change pre-C99 style function definition to C99
src/config.aap.in: remove A-A-P build system configuation file
src/dimm.idl: remove Windows ActiveIMM interface definitions
src/dlldata.c: remove
src/dosinst.[c/h], uninstal.c: remove DOS/Windows install and uninstall programs