remove unused module

- the compiler uses rt/invariant.d which contains
  an identical implementation but uses extern (D)
Merge pull request #443 from dawgfoto/unused

remove unused module
make llmath work with PIC
Merge pull request #444 from WalterBright/fixllmath

Fixllmath
fix ModuleInfo foreach

- break only stops inner loop but continues
  iteration if there are multiple SectionGroups
Merge pull request #446 from dawgfoto/fixModuleInfoApply

fix ModuleInfo foreach