build.llvm fix to allow pass arguments

This allows pass arguments to be specified (written by Cristiano)
Adjust LLVM MINIX scripts for new source layout

Adjust to the fact that drivers and servers have moved into the minix
subdir.
Skip modules that don't work on x86

Skip the following modules in relink.llvm/build.llvm:
 - i2c
 - gpio
 - cat24c256
 - tsl2550
Add /usr/lib/bc/libgcc_s.a to the file list

Add /usr/lib/bc/libgcc_s.a in distrib/sets/lists/minix/mi.
minix/llvm/passes/Makefile.inc: Fix

This fixes and documents a mistake made during the sources move.
Fix bitcode support for kernel