12 bugfixes patches

[Reini U. <rei...@gm...>]

See also https://github.com/rurban/clisp/issues

I’m not sure about the makemake: fix clisp.rc for prerelease PRODUCTVERSION patch
It’s broken, but my shell/sed fu is not quite good enough I guess.

The cygwin/modprep patches are several years old and still needed.
The win32 patches are needed for the latest mingw64, which my smoker is using now:
https://ci.appveyor.com/project/rurban/clisp/build/clisp-ci-2.49.50+-109.cf4ec77
iconv is needed for mac with gnu libiconv.

lightning is a big todo. I wanted to try llvm, but first I thought we have to fix lightning. 
it should be much faster than llvm, I think. compile-time trumps run-time with most calls.
only with some very often used calls llvm would make sense, I think. Or trace and guard the types, 
and assume the next calls will use the same types and path. (pypy, v8, …)